‘A’isha reported the Prophet as saying, "Give presents to one another, for a present removes grudges.”
…transmitted it. (Mirqat, 3:380 says that Tirmidhi is the source in which this tradition is found. I have looked for it with the help of the Concordance, but have been unable to find it.
Anas said that when God’s Messenger came to Medina the Emigrants came to him and said, “Messenger of God, we have never seen people more liberal out of abundance or better in giving help when they have little than a people among whom we have settled. They have removed our trouble and shared with us their pleasant things so that we are afraid they will get the whole reward." He replied, ‘No, as long as you make supplication to God for them and express commendation of them*.”
* They have no reason to fear that the Ansar will get all the reward from God so long as due expression of thanks is made.
Abu Huraira reported the Prophet as saying, "Give presents to one another for a present removes rancour from the breast, and a woman should not despise even the gift of half (Or part of) a sheep’s trotter from her neighbour.”