This statement is narrated from Imam Shabi with this chain of transmission.

Hazrat Mansur says that when Ibrahim used to write a letter, he would write: Peace be upon you. Translation: In this, I praise Allah, besides whom there is no true deity, and He alone is worthy of praise. His being is blessed and exalted. His is the dominion and His is the praise, and He has power over everything.

Hazrat Muhammad bin Souqah says that I went to Hazrat Naeem bin Abi Hind, and he took out a scroll and showed it to me. It was written in it as follows: From Abu Ubaidah bin Jarrah and Mu'adh bin Jabal to Hazrat Umar bin Khattab. Peace be upon you. Amma ba'd: After praise and blessings. And then when Hazrat Umar wrote a reply to both of them, it was as follows: From Umar bin Khattab to Hazrat Abu Ubaidah bin Jarrah and Hazrat Mu'adh bin Jabal, peace be upon both of you, amma ba'd.

Imam Sha'bi narrates that Hazrat Aisha (may Allah be pleased with her) wrote a letter to Hazrat Muawiyah, in which she wrote: "Amma ba'd."

Hazrat Abu Qilabah narrates that the person who read Hazrat Uthman's letter to me, or upon whom Hazrat Uthman's letter was read, stated: He (Hazrat Uthman) had written as follows: "Amma ba'd."

Hazrat Abda bin Sulaiman states that Hazrat Hisham bin Urwah said: I have read the letters of the Noble Prophet (peace and blessings be upon him); whenever a matter would conclude, he (peace and blessings be upon him) would say, "Amma ba'd."

Hazrat Aamir narrates that Hazrat Ziyad said: Surely, Dawood was granted the decisive speech, "Amma Ba'd."

Hazrat Ja'far bin Burqan narrates that Hazrat Umar bin Abdul Aziz wrote in a letter: "Amma ba'd." Then he stated: In the letters of the Noble Prophet (peace and blessings be upon him), it was also written as "Amma ba'd."

27522 - (Then) (1) he said: It was in the letters of the Prophet صلی اللہ علیہ وسلم : "Amma ba'd" (2).

Hazrat Zaid bin Aslam narrates that my father sent me to Hazrat Ibn Umar (may Allah be pleased with them). I saw him writing a letter, and he wrote: Bismillah ir-Rahman ir-Raheem. Amma ba'd.