בִּטְח֥וּ בַֽיהוָ֖ה עֲדֵי־עַ֑ד כִּ֚י בְּיָ֣הּ יְהוָ֔ה צ֖וּר עוֹלָמִֽים׃
Trust ye in the LORD for ever, For the LORD is GOD, an everlasting Rock.
Rashi on Isaiah
for in Yah, the Lord For we must rely on Him for He is the fear of God, the rock and everlasting shelter.
Ibn Ezra on Isaiah
Trust ye, etc. Therefore fathers will say to their children, Trust in the Lord, etc.
Ibn Ezra on Isaiah
ביה In the Lord. ב is a preposition, and has its usual meaning.5The name of God consists of the four letters ו ,ה ,י, and ה; the name יה of half that number; in ביה the ב is prepositive; but some take it as part of the name, believing that new names of God are formed by combining the word יה with any letters of the alphabet; e.g., גיה ,ביה ,איה, and so on. In his commentary on the book of Psalms (68:5), I. E. rejects this opinion, but without giving the explanation which is promised here.5The name of God consists of the four letters ו ,ה ,י, and ה; the name יה of half that number; in ביה the ב is prepositive; but some take it as part of the name, believing that new names of God are formed by combining the word יה with any letters of the alphabet; e.g., גיה ,ביה ,איה, and so on. In his commentary on the book of Psalms (68:5), I. E. rejects this opinion, but without giving the explanation which is promised here.5The name of God consists of the four letters ו ,ה ,י, and ה; the name יה of half that number; in ביה the ב is prepositive; but some take it as part of the name, believing that new names of God are formed by combining the word יה with any letters of the alphabet; e.g., גיה ,ביה ,איה, and so on. In his commentary on the book of Psalms (68:5), I. E. rejects this opinion, but without giving the explanation which is promised here.