'Truth' in the Bible

The elder unto the elect lady and her children, whom I love in the truth; and not I only, but also all they that have known the truth;

because of the truth that remains in us and will be with us forever.

Grace be with you, mercy, and peace, from God the Father, and from the Lord Jesus Christ, the Son of the Father, in truth and love.

I rejoiced greatly that I found of thy children walking in truth, as we have received a commandment from the Father.