Faithfulness is a fruit of the Spirit, “But the fruit of the Spirit is love, joy, peace, longsuffering, kindness, goodness, faithfulness, gentleness, self-control. Against such there is no law.” Galatians 5:22-23
We need to cultivate fruits.
The Greek word for faith and faithfulness is “pistis” is moral conviction of religious truth, or the truthfulness of God.
“A faithful man will abound with blessings…” Proverbs 28:20