Sahih Muslim 1587a

I was in Syria (having) a circle (of friends). in which was Muslim ibn Yasir. There came Abul-Ashath. He (the narrator) said that they (the friends) called him: Abul-Ashath, Abul-Ashath, and he sat down.

I said to him: Narrate to our brother the hadith of Ubada ibn Samit. He said: Yes. We went out on an expedition, Muawiyah being the leader of the people, and we gained a lot of spoils of war. And there was one silver utensil in what we took as spoils. Muawiyah ordered a person to sell it for payment to the people (soldiers). The people made haste in getting that.

The news of (this state of affairs) reached Ubada ibn Samit, and he stood up and said: I heard the Messenger of Allah (sallallahu alayhi wa sallam) forbidding the sale of gold by gold, and silver by silver, and wheat by wheat, and barley by barley, and dates by dates, and salt by salt, except like for like and equal for equal. So he who made an addition or who accepted an addition (committed the sin of taking) interest.

So the people returned what they had got. This reached Muawiyah. and he stood up to deliver an address. He said: What is the matter with people that they narrate from the Messenger (sallallahu alayhi wa sallam) such tradition which we did not hear though we saw him (the Prophet (sallallahu alayhi wa sallam)) and lived in his company?

Thereupon, Ubida ibn Samit stood up and repeated that narration, and then said: We will definitely narrate what we heard from the Messenger of Allah (sallallahu alayhi wa sallam) though it may be unpleasant to Muawiyah (or he said: Even if it is against his will). I do not mind if I do not remain in his troop in the dark night. Hammad said this or something like this.