Maliks Muwatta Book 051, Hadith Number 005.

Section : The Sunna on Hair.

Yahya related to me from Malik that Safwan ibn Sulaym heard that the Prophet, may Allah bless him and grant him peace, said, "I and the one who guards the orphan, whether for himself or for someone else, will be like these two in the Garden, when he has taqwa," indicating his middle and index fingers.