Musnad Ahmad 25:349

Hujayn ibn al-Muthanna and Yunus said: Abd al-Aziz—meaning Ibn Abi Salamah—narrated to us, from Ibrahim ibn Uqbah, from Kurayb, the freed slave of Abdullah ibn Abbas, from Abdullah ibn Abbas, who said: "The Prophet, may Allah bless him and grant him peace, passed by a woman who had a young boy with her in a litter, and she took hold of his upper arm and said: 'O Prophet of Allah, is there a Hajj for this one?' He said: 'Yes, and you have a reward.'"