What is the Biblical evidence that God exists outside of time?

It is common to hear phrases such as "God exists outside of time" used to explain away anachronism or avoid addressing it altogether--for example, the idea that God has in the past progressed to become Who He Is today is sometimes dismissed as nonsensical because being "outside of time" is interpreted to preclude such contemplation. But if that were true, then why do Scriptures make reference to the acts of God within time, and ascribe causality at all to His acts and attributes? We might take license from such expressions so as to hand-wave further understanding of the true nature of God out of our minds. However, numerous passages in the Bible describe God and His acts in time, including His progression and development. The law of causality is never violated. For example, Luke 2:52 states, "And Jesus grew in wisdom and stature, and in favor with God and man." The central message of the Bible is that the Son of God came down from the presence of His Father, took upon Himself a tabernacle of flesh, and submitted to the Father in all things, including paying the price for sin so that we could be redeemed on conditions of repentance. For all we might say about being "outside of time", an assertion that God does not obey or is not consistent with laws of causation is clearly untenable. What Bible verse or verses suggest that God "exists outside of time", or gives a sensible definition to what that might more appropriately mean? I am not asking for philosophical interpretations, lawyerisms or hand-waving references to what so-called "mainstream Christianity" teaches. I am asking what the Bible says. Note that verses saying or suggesting that God has always existed or is eternal (which I accept) are not the same as saying He has never changed or is "outside of time". Such verses explicitly mention notions of time and causality as being valid and applicable to God as well as everything else.