Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: "The Messenger of Allah (peace and blessings be upon him) was born on a Monday, revelation came down upon him (peace and blessings be upon him) on a Monday, and he (peace and blessings be upon him) passed away on a Monday."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11078