869/1 - Abu Hurayrah (may Allah be pleased with him) reported that the Prophet (may Allah’s peace and blessings be upon him) said: “When one of you arrives at a gathering, he should say the greeting of peace. When he wants to get up and leave, he should say the greeting of peace, for the former is not more important than the latter.” [Narrated by Abu Dāwūd and Al-Tirmidhi, who classified it as Hasan (sound)]
1) It is a sign of the perfection and justice of the Shariah that it made the first and last greetings equally important.
2) Our religion urges us to gain plenty of rewards by giving the greeting of peace at the beginning and end of gatherings.
Giving the greeting of peace when leaving a gathering is a Prophetic etiquette that is commonly abandoned now. More than anyone else, the scholars and seekers of knowledge should work to revive it. As they enter a gathering or leave it, they should give the greeting of peace, for the former is not more important than the latter.
Also, when a man enters or leaves his house, he should greet his family.
Anas (may Allah be pleased with him) reported that the Messenger of Allah (may Allah’s peace and blessings be upon him) said to him: “O son, when you enter your house, give your family the greeting of peace, for it will be a blessing for you and your household.” [Narrated by Al-Tirmidhi]