Musannaf Ibn Abi Shayba 33:817

Al-Hasan ibn Musa narrated to us, he said: Mahdi 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 God bless him and grant him peace, who said: "For every glorification (tasbihah) is a charity."