Commentary for Isaiah 38:11

[Addendum: I will not see the Eternal (יָהּ) I will no longer use the name יָהּ.

I shall not see the Lord, etc. God is not subject to accidents, that a human eye should be able to perceive Him; He is, however, known by His works. The meaning of this verse is therefore: I shall not see any longer the works of the Almighty; I shall not understand the works of the Lord in this world, in the land of the living. These latter words are thus added as a kind of explanation of the preceding phrase. The pleasure which man has in this world in understanding the works of the Almighty is first mentioned; and then, in the words, I shall behold man no more, his pleasure in seeing his fellow-men.

in the land of the living The living use it, but the dead are not permitted, as it is said (Ps. 115:17): “The dead shall not praise the Eternal (יָהּ).” It is a rule for the dead that they may never mention the Name consisting of two letters.]