Chapter "The Chapter on Smiling" Explanation of the Hadith of Jarir ibn 'Abd Allah al-Bajali (may Allah be pleased with him) who said

The Shaykh : And now "The Chapter on Smiling", which is the twenty-fifth chapter after the hundredth.
The author (may Allah have mercy on him) narrates it with his authentic chain of narration.
From Jarir, who is ibn 'Abd Allah al-Bajali, who said: .
The point of this hadith is its first part, which clarifies that it was among the manners and character of the Messenger (peace be upon him) in his companionship with his Companions that he would be cheerful and smile at their faces. Therefore, Jarir ibn 'Abd al-Bajali says: . This smiling has previously been mentioned to us in some hadiths as being one of the acts of charity. By this and similar acts of charity that Allah has made easy for Muslims, a Muslim, whether male or female, can become wealthy in rewards. In fact, such actions may cause one to surpass many of the wealthy and the rich. The Messenger (may Allah's prayers and blessings be upon him) said in a hadith: . Therefore, it was very natural for the Messenger (may Allah's prayers and blessings be upon him) to treat his Companions with this kind of etiquette, which he directed them to when he said to them: .
However, there is something here that must be mentioned, especially since we are often asked about it. I was recently in Jordan, and one of the doctors there asked me: What is your opinion about a gathering held between men and women, or between young men and young women, where the women are wearing the jilbab in accordance with the Shari'ah? What is your opinion of this gathering? He rightly called it mixing. Indeed, it is mixing, even if it is within the limits we have mentioned.
I told him: If we want to stick to the literal, verbal meaning, I would say: As long as the women in this gathering are wearing the jilbab and are covered with the Shari'ah covering, there is nothing wrong with this gathering. But the truth, I told him, is that this cannot be anything but theoretical. In practice, how can you imagine such a gathering, from beginning to end, being controlled by such composure that none of the attendees speaks a word that causes one of the women present to smile or laugh? Who is able to control such a mixed gathering of women and men so that nothing comes from any of the attendees that would lead the others to laugh or smile? This is practically impossible. Therefore, the more prescribed course is to avoid holding such mixed gatherings of women and men under the claim that the covering is available. Because the availability of the covering is one of the conditions and one of the obligatory etiquettes in Islam, but there is a type of speech and a type of conversation. If a man smiles at a woman there, or vice versa, a woman at a man, let alone laughing, let alone loud laughter, then at that point the gathering ceases to be an etiquette and ceases to be an Islamic gathering. Therefore, we do not see the approval of such gatherings at all, as long as there is a way to avoid them, because a person cannot control himself from laughing sometimes, and he laughs at the others. Then Satan has knocked on the door of the attendees for trial and fitnah.
Therefore, if it was among the etiquette of the Messenger (peace be upon him) that he did not meet his Companions but with a smile on their faces, acting on his saying to them: , then we must understand this hadith in light of the Islamic rules, one of which is the chapter of blocking the means to harm. So a man smiles at a man, and a woman smiles at a woman, and not the other way around. A man does not smile at a woman who is a stranger to him, nor does a woman smile at a man who is a stranger to her, because this is a key to fitnah. Except if there is a prohibition of marriage, meaning a man smiles, and even laughs, at his daughter, his sister's daughter, and the like of those with whom marriage is prohibited. As for a woman who is a stranger to him, it is not permissible for him to meet her except with all modesty and all composure, and as far as possible from fitnah.
So, smiling at the face of a Muslim brother is charity. But the same gender with the same gender, and the familiar with his familiar one, this is the point of this hadith, which is the first part. It is that among the guidance of the Messenger (may Allah's prayers and blessings be upon him) and among his Sunnah was that when he met one of his Companions—(and upon you be peace and the mercy of Allah and His blessings)—he would smile at his face. This means that the Messenger (peace be upon him) was not harsh, as they say today, nor was he frowning and scowling, but he was cheerful and smiling. So, Allah, Mighty and Majestic, describes him by saying: .
Then, in the completion of this hadith, there is a benefit that when Jarir (may Allah be pleased with him) came to enter upon the Prophet (peace and blessings be upon him), he said to them, announcing the arrival of this Jarir: . He is Jarir ibn 'Abd Allah al-Bajali, from a tribe of the Yemeni tribes. So the Messenger (may Allah's prayers and blessings be upon him) informed them that he was from the best of this tribe by saying: , meaning that on his face were the marks of royalty, blessing, and beauty. And it was so, because the Messenger (may Allah's prayers and blessings be upon him) does not speak except the truth. This is a hadith about smiling, the smiling of the Messenger (peace be upon him).