It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that I heard the Messenger of Allah (peace and blessings be upon him) say: "There are three things that are obligatory upon me but are voluntary for you: one is Witr, the second is (offering) sacrifice even if one does not possess the minimum amount (of wealth), and the third is the Duha (forenoon) prayer."