Ibn 'Abbas said, "I think that answering a letter is a duty, just like returning the greeting."

A'isha bint Talha said, "I spoke to 'A'isha when I was under her protection. people used to visit her from all places. Shaykhs used visit me because of my place with her. Young men used to treat me as a sister and give me presents and write to me from their cities. I said to 'A'isha, 'Aunt, this is a letter from so-and-so and his gift.' 'A'isha told me, 'My girl, answer him and reward him. If you do not have anything to give, I will give you something.' She told her to give it to her."

Abdullah ibn 'Umar wrote to 'Abdu'l-Malik ibn Marwan in order to pledge him his allegiance. He wrote to him, "In the Name of Allah, the All-Merciful, Most Merciful. To 'Abdu'l-Malik, the Amir al-Mu'minin, from 'Abdullah ibn 'Umar. Peace be upon you. I praise Allah to you. There is no god but Him. I offer you obedience according to the sunna of Allah and the sunna of His Messenger as much as I can."

Zayd ibn Aslam said, "My father sent me to Ibn 'Umar and I saw him write, 'In the Name of Allah, the All-Merciful, Most Merciful. Following on from that'"