Silsilat al-Ahadith al-Sahihah

It is narrated from Sayyiduna Abu Umamah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Indeed, a person, due to his good character, attains the rank of one who stands (in prayer) at night and endures thirst in the heat of the day (by fasting)."