My brother Mark/Oct31st1517 explains this well.

(Hat tip to a brother named Jimmy, for the Proverbs 30:4 reference, which I later mentioned to Mark.)

God is the same yesterday, today and forever. Including His triune nature, Father, Son and Holy Spirit, Matthew 28:19.

Related post: The Trinity, a Godhead of 3 Persons, 3 That are the One True God, Proven via Hebrew Scripture