The Hadith of the Bedouin: (Is there anything else required of me? He said: No, except what you do voluntarily).

The Shaykh : ... If that is the case, does the statement that the greeting of the mosque is obligatory contradict the saying of the Messenger (peace and blessings be upon him) to that Bedouin or that man ?
Answer: There is no contradiction, because the intended meaning of his saying (peace be upon him): is in connection with the five daily prayers, just as is the case with the ten rak'ahs of the regular voluntary prayers (rawatib). So whenever a Muslim prays one of the obligatory prayers, it is recommended (sunnah) for him to pray two rak'ahs. As for the greeting of the mosque, it is not obligatory for every person who prays one of the five daily prayers; because he may not pray in the mosque, he may not enter the mosque. That is: if the cause that necessitates the greeting is present, he must pray them, and that is entering the mosque. Likewise, it does not contradict his saying (peace be upon him): the statement—which is the stronger position (rajih) among the scholars—that the two 'Id prayers are obligatory; because these two prayers are not among the five daily prayers that are repeated with the coming of each day, but rather they are two prayers that occur twice in the year: the prayer of 'Id al-Fitr and the prayer of 'Id al-Adha. Likewise, apply this reasoning to the following: Does the aforementioned Hadith of the Bedouin contradict the statement that the eclipse prayer is obligatory? It does not contradict that, why? Because it is prayed for a transient matter, which is the eclipse of the sun, and he (peace and blessings be upon him) commanded it in the hadith agreed upon by al-Bukhari and MuslimThe Shaykh : as came from Ibn 'Abbas and from the Lady 'Aishah and from a large number of the Companions that the sun was eclipsed on the day of the death of Ibrahim, the son of the Prophet (peace and blessings be upon him). So the people, or some of the people—based on their custom in the pre-Islamic age of ignorance (jahiliyyah)!—said: "The sun was not eclipsed except for the death of Ibrahim, the son of the Prophet (peace and blessings be upon him)." So he (peace and blessings be upon him) delivered a sermon to them and said to them: . So he (peace and blessings be upon him) commanded the eclipse prayer for this divine phenomenon; so it does not contradict the statement of its obligation, as some of the Imams of hadith explicitly stated. I mention among them Abu 'Uwanah in his Musnad, known as "Sahih Abu 'Uwanah"—which is an extraction from "Sahih Muslim"—where he said: "Chapter on the Obligation of the Eclipse Prayer." It also does not contradict the statement of the obligation of this prayer the saying of the Prophet (peace and blessings be upon him): as I have mentioned more than once that the intended meaning of "except what you do voluntarily" is in connection with these five daily prayers. So that does not contradict that something else may be obligatory on the occasion of a situation that befalls the Muslim, which is not originally obligatory upon him.