who instructed him to go into the mosque and perform two units of prayer.

I do not think that anyone today—except a very small number—acts upon this sunnah. People neglect it only because they are unaware of it; otherwise, it is easy to do, and all praise is due to Allah.

Whether you offer those two units in the neighborhood mosque where you usually pray, or in the first mosque you come across when you arrive in town, the sunnah is fulfilled.

Third: Kaʿb ibn Mālik—may Allah be pleased with him—was a man of compelling argument and eloquent speech; yet, out of his piety and fear of Allah, he refused to lie and told the Prophet, peace and blessings be upon him, the unvarnished truth.

Fourth: A person who is angry may still smile. Someone might ask, “How can I tell whether this smile expresses approval or displeasure?” The answer lies in contextual clues such as changes in facial color and expression. By these signs one can recognize whether the smile conveys satisfaction with what has been done or anger toward it.

Fifth: It is permissible for someone who is standing to greet a person who is seated, for Kaʿb greeted the Prophet while standing, and the Prophet said to him, “Come closer.”

Sixth: Speech delivered at close range is more effective than speech delivered from afar. The Messenger of Allah, peace and blessings be upon him, could have spoken to Kaʿb ibn Mālik while he stood at a distance, yet he told him to draw near