It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "I have been commanded to perform two rak‘ahs of Duha (forenoon prayer) and Witr, but they have not been made obligatory upon my Ummah."
Hadith Referenceمسند احمد / ومن مسند بني هاشم / 2065
Hadith Gradingحکم دارالسلام:إسناده ضعيف، جابر الجعفي ضعيف.