Silsilah as-Sahihah 843 — Fasting on Ashura and ninth of Muharram

It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings of Allah be upon him) said: "If I remain alive till the next year, I will also fast on the ninth of Muharram, so that the risk of missing the fast of the Day of Ashura is eliminated."