Musnad Abu Ya'la al-Mawsili 129:107

Abu Bakr ibn Abi Shaybah narrated to us, Mu'adh ibn Mu'adh narrated to us, from Humayd, from Anas, who said: When Abd al-Rahman ibn Awf arrived as an emigrant to the Prophet, may God bless him and grant him peace, he established brotherhood between him and Sa'd ibn al-Rabi'. Sa'd said to him, "I have wealth, so I will divide it in half for you. And I have two wives, so look at whichever of them is more beloved to you, and I will divorce her; then when her waiting period has ended, you marry her." Abd al-Rahman said to him, "May God bless your family and your wealth for you. Show me the market." He did not return that day until he had brought something he had acquired from the market. The Messenger of God, may God bless him and grant him peace, missed him for a few days, then he came to him, and upon him was a trace of yellow (saffron). The Messenger of God, may God bless him and grant him peace, said to him, "What is this?" He said, "I have married a woman from the Ansar." He said, "What did you give her as a dowry?" He said, "A date-stone's weight of gold," or he said, "The weight of a date-stone of gold." The Messenger of God, may God bless him and grant him peace, said to him, "Give a wedding feast, even if with a sheep."