ὅτι

originally was the neuter of ὅστις, that, Mt. 2:16, 22, 23; 6:5, 16; often used pleonastically in reciting another’s words, Mt. 9:18; Lk. 19:42; Acts 5:23; as a causal particle, for that, for, because, Mt. 2:18; 5:3, 4, 5; 13:13; because, seeing that, since, Lk. 23:40; Acts 1:17