Musannaf Ibn Abi Shayba 33:816

Waki’ narrated to us, from Mis’ar, from ‘Abd al-Malik ibn Maysarah, from Hilal ibn Yasaf, who said: ‘Abdullah said: "That I should perform tasbih (saying 'SubhanAllah') a number of times is more beloved to me than that I should spend the equivalent number of them in dinars in the way of Allah."