Surah 19. Maryam, Ayah 36

Cf. 3:51 and 43:64 .

As opposed to the crooked superstitions which take refuge in all sorts of metaphysical sophistries to prove three in one and one in three. In the Qur-an there is no crookedness (xviii. 1). Christ's teaching was simple, like his life, but the Christians have made it crooked.