In China, four Sahabas (Sa'ad ibn abi Waqqas, Wahb Abu Kabcha, Jafar ibn Abu Talib and Jahsh ibn Riyab) preached in 616/17 and onwards after following the Chittagong–Kamrup–Manipur route after sailing from Abyssinia in 615/16. After conquering Persia in 636, Sa'ad ibn abi Waqqas went with Sa'id ibn Zaid, Qais ibn Sa'd and Hassan ibn Thabit to China in 637 taking the complete Quran. Sa'ad ibn abi Waqqas headed for China for the third time in 650–51 after Caliph Uthman asked him to lead an embassy to China, which the Chinese emperor received.Khamouch, Mohammed. "Jewel of Chinese Muslim's Heritage". FTSC.
