'Art' in the Bible

For to which of the angels did God ever say, "My Son art Thou: I have this day become Thy Father;" and again, "I will be a Father to Him, and He shall be My Son"?

and, as though they were a mantle Thou wilt roll them up; yes, like a garment, and they will undergo change. But Thou art the same, and Thy years will never come to an end."

So Christ also did not claim for Himself the honour of being made High Priest, but was appointed to it by Him who said to Him, "My Son art Thou: I have to-day become Thy Father;"

as also in another passage He says, "Thou art a priest for ever, belonging to the order of Melchizedek."

For the words are in evidence, "Thou art a priest for ever, belonging to the order of Melchizedek."

for these men hold office without any oath having been taken, but He holds it attested by an oath from Him who said to Him, "The Lord has sworn and will not recall His words, Thou art a Priest for ever" --