A. G. Garr and his wife were sent from Azusa Street as missionaries to Calcutta, India, where they managed to start a small revival. Speaking in tongues in India did not enable them to speak the native language, Bengali. The Garrs later traveled to China where they arrived in Hong Kong and began to spread Pentecostalism in mainland China. They did this by working through other Protestant churches and organizations that had already been established. Garr significantly contributed to early Pentecostalism through his later work in redefining the "biblical evidence" doctrine and changing the doctrine from a belief that speaking in tongues was explicitly for evangelism to a belief that speaking in tongues was a gift for "spiritual empowerment".