Sahl b. Sa'd al-Sa'idi (Arabic: سَهل بن سَعد الساعِدي), (d. 88/707 or 91/709-710) was one of the companions of the Prophet (s) and a close companion to Imam 'Ali (a). He narrated many hadiths among which is Hadith of Ghadir. He was honored for giving two allegiance to the Prophet (s), presence in the Battle of Tabuk and praying towards two qiblas. He encountered the caravan of captives of Karbala in Damascus and reported on how they entered the city. He was the last companion of the Prophet (s) who passed away in Medina.
He narrated hadiths from the Prophet (s), Imam 'Ali (a), Lady Fatima (a) and some companions. Abu Hurayra, Sa'id b. Musayyib, Zuhri, Abu Hazim and his son, 'Abbas b. Sahl, narrated hadiths form him. He narrated a hadith from Lady Fatima (a) that he asked her about the Imams and she answered that the Prophet (s) named 'Ali (a) and eleven of his descendants as Imams one after another. He is one of the witnesses and narrators of the event of Ghadir Khumm. He also narrated the famous Hadith of Rayat from the Prophet (s) about Imam 'Ali (a):
- "tomorrow I will give the flag to whom Allah and His messenger like and he likes Allah and His messenger. He will not return, before Allah brings the triumph on his hand."
In Damascus, where Ahl al-Bayt (a) were taken to after the martyrdom of Imam al-Husayn (a), he caught up with the caravan of Ahl al-Bayt and asked the daughter of Imam al-Husayn (a) if she had any request. She told him to ask the carrier of Imam al-Husayn's (a) head to move further from women of Ahl al-Bayt so that the people would not look at them.