Musannaf Ibn Abi Shayba 3:541

Waki’ narrated to us, from Usama bin Zayd, from Muhammad bin Qays, from his mother, from Umm Salama, who said: The Prophet (peace be upon him) was praying, and ‘Abdullah or ‘Umar bin Abi Salama passed in front of him. He gestured with his hand, so he went back. Then Zaynab, the daughter of Umm Salama, passed by. He gestured with his hand like this, and she proceeded. When the Messenger of Allah (peace be upon him) finished his prayer, he said: "They are more persistent."