attest [attested, attesting, attests]◼◼◼verb [UK: ə.ˈtest] [US: ə.ˈtest]I can attest to his innocence. = Je peux attester de son innocence.
testify [testified, testifying, testifies]◼◼◻(to make a declaration, or give evidence, under oath) verb [UK: ˈtest.ɪ.faɪ] [US: ˈtest.ə.ˌfaɪ]And I testify that this is the Son of God. = J'atteste qu'il est le Fils de Dieu.