SB 8.12.44
yam mam aprcchas tvam upetya yogat
sama-sahasranta uparatam vai
sa esa saksat purusah purano
na yatra kalo visate na vedah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
When I finished performing mystic yoga for one thousand years, you asked me upon whom I was meditating. Now, here is that Supreme Person to whom time has no entrance and who the Vedas cannot understand.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Eternal time enters anywhere and everywhere, but it cannot enter the kingdom of god. Nor can the Vedas understand the Supreme Personality of Godhead. This is an indication of the Lord’s being omnipotent, omnipresent and omniscient.