Psalm 145 makes up the bulk of the oft recited prayer known as Ashrei. It is an alphabetic acrostic (missing the letter nun) about the greatness of God. The verses beginning with Alef, Bet, Dalet, ...
In Tehilim ch. 25 it goes through the entire alphabet and skips the letter "Bais" "Vav" & "Kof"; why so?
Avarham Avinu was originally Avram - and Hashem added the letter Hai to his name and changed it to Avraham. Why from all letters was the letter Hai added?