Noah Webster's Dictionary (p. pr. & vb. n.) of Affirm.

Multi-Version Concordance Affirming (3 Occurrences) Luke 22:59 And one hour, as it were, having intervened, a certain other was confidently affirming, saying, 'Of a truth this one also was with him, for he is also a Galilean;' (YLT) Acts 12:15 and they said unto her, 'Thou art mad;' and she was confidently affirming 'it' to be so, and they said, 'It is his messenger;' (YLT) Acts 24:9 The Jews also joined in the attack, affirming that these things were so. (WEB ASV RSV)