It is narrated from Hazrat Ya'la (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said to him: When my messengers come to you, give them thirty coats of mail and thirty camels (or he mentioned a lesser number). He asked: O Messenger of Allah! Are these to be given as a loan to be returned? The Prophet (peace and blessings be upon him) said: Yes!