Habib bin Abi Thabit حبيب بن أبي ثابت قيس · The Book on Virtues of Jihad

That the Prophet (ﷺ) said: "A worshipper does not fast a day in the cause of Allah except that, that day (of fasting) distances the Fire from his face by seventy autumns." This Hadith is Hasan Sahih.