The best texts read φυλαÌξῃ, keep (them).
Came (ἦλθον)
The aorist tense, pointing to the purpose of the coming, as I am come (Joh 12:46) to the result. Compare Joh 8:14; Joh 9:39; Joh 10:10; Joh 12:27, Joh 12:47; Joh 15:22. Both tenses are found in Joh 8:42; Joh 16:28.