Musnad Abu Ya'la al-Mawsili 152:298

And from Hammad, who said: 'Ata' ibn al-Sa'ib informed us, from Ibn Adhnan, who said: I lent Alqama two thousand dirhams. When his stipend (ata') came out, I said to him, "Pay me back." He said, "Delay me until next year." I refused him, and I took it from him. He said: I came to him after that, and he said, "You have troubled me, and you have withheld [the money] from me." I said, "Yes, it is your own action." He said, "What is my matter?" I said, "You narrated to me from Ibn Mas'ud that the Prophet, peace and blessings of Allah be upon him, said: 'Indeed, the loan (al-salaf) runs in the course of half of charity.'" He said, "Yes, it is indeed so." He said, "Then take it now."