Sayyiduna Ibn Abbas (may Allah be pleased with them both) says: I spent the night at the house of my maternal aunt Sayyidah Maymunah (may Allah be pleased with her), and it was her night (in turn). The Prophet (peace and blessings be upon him) stood up to pray, and I stood on his (peace and blessings be upon him) left. He (peace and blessings be upon him) took hold of my forelock, or (the narrator is unsure) my hair, and made me stand on his right.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 12403