Musannaf Ibn Abi Shaybah 23093 — A pledge with the words: If it is not

It is narrated from Ibrahim (may Allah have mercy on him) concerning a man who leaves a pledge with another and says: If I do not come to you with it by such-and-such a time, then this item is yours. He said: If the stipulated thing cannot be paid, the pledge-holder does not become its owner. And if, when leaving the pledge, he says: If I do not come to you with it by such-and-such a time, then sell it and take in full what is owed to you. He said: He cannot be his own trustee. He should not sell it.