Acts 2:34

34. David is not ascended And it is not, therefore, David’s exaltation that the prediction announces. And as the Jewish Church admits that the Messiah, and he alone, is foretold in David’s psalms, so if it be not David, it must be Messiah.

The Lord David’s Hebrew for Lord (Psalm cx) is JEHOVAH, which is God’s proper name; just as David is the proper name of the man so named. It is, therefore, an incommunicable name, belonging to the God of Israel alone. So solemnly did the ancient Jews reverence is as never to utter it vocally; and as the ancient Jews had no vowels in their writing, so both the pronunciation and the proper vowels are lost. When the sacred name occurred in the Holy Text, the Jews in reading substituted the word Adonai, Lord; and when the vowel characters were afterward invented, not knowing the proper vowels to be added to the consonants of the sacred name, they gave it the vowels of the word Adonai. Nor is it probable that these were the proper vowels, nor are they certainly known. The English translators, most improperly following in many places the example of the Septuagint, have rendered the name Jehovah by the word LORD, spelling it, however, as here, in capitals.