The Hòa Hảo Buddhist undocumented texts mentioned the so called Four Mountainous Pilgrimages of Huỳnh Phú Sổ. Notably, the founder of the new religion visited the Seven Mountains, or Thất Sơn, area in Châu Đốc province near the Cambodian border, as well as Tà Lơn Mountain, also known as Bokor or Chaine des Eléphants, inside Cambodia. Adherents of Hòa Hảo Buddhism believed the “Precious Mountains,” or Bửu Sơn, held significant mysteries that will be revealed at an opportune time in the future, hence, pilgrimages to mountainous areas could have been viewed as acts of religious importance.
In the first trip, Huỳnh Phú Sổ and his father Huỳnh Công Bộ spent eight days visiting Tà Lơn Mountain in Kampot province, Cambodia.
The second trip involved a visit to Seven Mountains, or Thất Sơn in August 1939. Huỳnh Phú Sổ was accompanied by one trusted adept, Ngô Ngọc Chơn.
In his third trip of September 1939, Huỳnh Phú Sổ also visited Thất Sơn. He reportedly paid special attention to Cấm Mountain. He was accompanied by five adepts, Phan Văn Báo, Nguyễn Tấn Bực, Nguyễn Văn Gia, Nguyễn Văn Ban, and Ngô Ngọc Chơn.
In February 1940, Huỳnh Phú Sổ went to Thất Sơn and Bokor. Ngô Thành Bá escorted him during this final trip.
The actual purpose of these pilgrimages to the mountains is yet to be fully clarified. Some Hòa Hảo adepts have argued that during these trips Huỳnh Phú Sổ not only acquired but also demonstrated certain supernatural and paranormal abilities. Prior to the first trip, his father Huỳnh Công Bộ had not been fully convinced that his young son was a genuine religious leader. However, after the Tà Lơn pilgrimage, Huỳnh Công Bộ acknowledged and accepted the authenticity of Huỳnh Phú Sổs religious mission.