Muslim, Abu Dawud, At-Tirmidhi and An-Nasa'i recorded that Abu Hurayrah, may Allah be pleased with him, said: "The Messenger of Allah said:

آ«ظ…ظژظ†ظ’ طµظژظ„ظ‘ظژظ‰ ط¹ظژظ„ظژظٹظ‘ظژ ظˆظژط§ط­ظگط¯ظژط©ظ‹ طµظژظ„ظ‘ظژظ‰ ط§ظ„ظ„ظ‡ظڈ ط¹ظژظ„ظژظٹظ’ظ‡ظگ ط¨ظگظ‡ظژط§ ط¹ظژط´ظ’ط±ظ‹ط§آ»

(Whoever sends one Salah upon me, Allah will send ten upon him.) At-Tirmidhi said: "This is a Sahih Hasan Hadith. On the same topic, narrations come from `Abdur-Rahman bin `Awf, `Amir bin Rabi`ah, `Ammar, Abu Talhah, Anas and Ubayy bin Ka`b.''