Verses with the word gentleness in the New Testament (2 verses):

2 Corinthians 10:1
Now I Paul myself beseech you by the meekness and gentleness of Christ, who in presence am base among you, but being absent am bold toward you:

Galatians 5:22
But the fruit of the Spirit is love, joy, peace, longsuffering, gentleness, goodness, faith,