Sayyiduna Ruwayfi' bin Thabit (may Allah be pleased with him) said: I heard the Messenger of Allah (peace and blessings be upon him) forbidding intercourse with a pregnant woman until she gives birth, and he (peace and blessings be upon him) said: "Indeed, one of you (by doing so) adds to its (the child's) hearing and sight." And he also forbade intercourse with captive women until they become pure.
Then he said: "Beware of the usury (riba) of misappropriation." We said: O Messenger of Allah! What is the usury of misappropriation? He (peace and blessings be upon him) said: "That one of you obtains a garment and wears it until its freshness is gone, then throws it back into the spoils of war; and rides the animals until they are exhausted, then brings them back to the spoils of war."
Hadith Referenceالمعجم الكبير للطبراني / باب الراء / 4475