Silsilah as-Sahihah 904 — Virtue of voluntary fasting

It is narrated from Sayyiduna Abu Umamah (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: "Whoever fasts for one day in the way of Allah, Allah Almighty will place a trench between him and the Fire, the distance between its two edges will be as much as the distance between the earth and the sky."