Is it a sin for one who leaves off sending blessings upon the Prophet (peace and blessings be upon him), sending peace upon the Companions (may Allah be pleased with them), and sending mercy upon the deceased among the Muslims?

The student: Shaykh, may Allah reward you, some scholars have mentioned that completing good manners with Allah (Mighty and Majestic), with His Messenger (peace and blessings be upon him), with his Companions, and with the scholars is that when Allah the Exalted is mentioned, one says "Mighty and Majestic," when the Prophet is mentioned, one sends blessings upon him, when the scholars are mentioned, one sends mercy upon them, and when the Companions are mentioned, one sends peace upon them. Is this a general rule? And it was said that whoever leaves this off has missed a great good.

The Shaykh : As for sending blessings upon the Prophet (peace and blessings be upon him), there is no doubt that when he is mentioned, a person is commanded to send blessings upon him, either as an obligation or as a recommended practice. Some scholars have made it obligatory for you to send blessings upon him when the name of the Messenger is mentioned in your presence, based on the hadith: As for Allah (Mighty and Majestic), it is not a condition to praise Him when He is mentioned. For this reason, the Messenger (peace and blessings be upon him) always attributed speech to Allah without mentioning a description of might, majesty, exaltation, or blessing; sometimes he would say it and sometimes he would not. So it is better for you to sometimes say it and sometimes not. Likewise, regarding sending peace upon the Companions or sending mercy upon those who came after them, none of this is to be made a regular, fixed practice. However, if it is done occasionally, it is good. As for making it a regular, fixed practice, that requires evidence.