2 Timothy 2:2

And the things that you have heard from me among many witnesses, commit these to faithful men who will be able to teach others also.

1 Corinthians 4:2

Moreover it is required in stewards that one be found faithful.

Matthew 25:21

His lord said to him, ‘Well done, good and faithful servant; you were faithful over a few things, I will make you ruler over many things. Enter into the joy of your lord.’