'In the Faith' in the Bible

This witness is true, wherefore rebuke them sharply, that they may be sound in the faith,

That the elder men be sober, honest, discreet, sound in the faith, in love and in patience.

All that are with me salute thee. Greet them that love us in the faith. Grace be with you all, Amen. {Here ends the Epistle of Saint Paul unto Titus, Written from Nicopolis, a city of Macedonia.}