This article is about the 8th-century Buddhist poem. For the 2nd-century Taoist text, see The Kinship of the Three.
The Sandōkai (Chinese: 參同契; pinyin: Cāntóngqì) is a poem by the eighth Chinese Zen ancestor Shitou Xiqian (Sekito Kisen, 700–790) and a fundamental text of the Sōtō school of Zen, chanted daily in temples throughout the world.