Musannaf Ibn Abi Shayba 21:300

Al-Hasan ibn Musa narrated to us, Mahdi ibn Maymun narrated to us, from Wasil, from Yahya ibn 'Aqil, from Yahya ibn Ya'mar, from Abu al-Aswad al-Du'ali, from Abu Dharr, from the Prophet (may Allah bless him and grant him peace), who said: "Every glorification (tasbihah) is a charity."