'Abdullah ibn 'Amr reported that a man said, "Messenger of Allah,
which aspect of Islam is best?" He replied, "Feeding people and greeting
those you know and those you do not know."
Abu Hurayra reported that the Messenger of Allah, may Allah bless
him and grant him peace, forbade people to sit in courtyards and roads.
The Muslims said, "We will not be able to avoid it. We cannot undertake
it." He said, "If not, then give it its due." They said, "What is it due?"
He said, "Lower the eye, guide the traveller, wish for mercy on the person
who sneezes when he praises Allah and return the greeting."
Anas ibn Malik reported that the Companions of the Prophet, may
Allah bless him and grant him peace, used to gather and they would turn
towards the tree and a group of them would go to the right and a group
to its left. When they met again, they would greet one another.