Truths are truths, and lies are lies,  irrespective of who says it.  ~ Cheong Kok Weng

God is truth. It is an ontological way to refer to truth as one of God’s moral attributes.

It means truth flows out of God’s very nature and extends beyond Him being truthful to declaring that truth itself find its very source in His nature.

“Jesus saith unto him, I am the way, the truth, and the life: no man cometh unto the Father, but by me.”
‭‭John‬ ‭14:6‬

“That by two immutable things, in which it was impossible for God to lie, ..”
‭‭Hebrews‬ ‭6:18‬ a