Give salutations on behalf of others when passing by or sitting together in groups.

This hadith speaks about the importance of salutations when people are passing by or sitting together in a group. It teaches us that it is enough if only one person from the group gives the salutation and another person replies to it. This hadith encourages us to be polite and respectful towards each other, especially when we are in groups. We should greet each other with kindness and respect, as this will create an atmosphere of peace and harmony among us. Furthermore, this hadith also teaches us that we should not be too demanding or expect everyone to do something; rather, it is enough if only one person does it on behalf of all others present in the group.