HE

This is the name of the fifth letter of the Hebrew alphabet. In the Hebrew language, each line of verses 33-40 begins with this letter.

your statutes

This is another way of describing the Law of Moses.

Possible meanings are 1) "completely" or 2) "to the end of my life" or 3) "to the end of time."

"obey your law"

"I will surely observe your law" or "I am completely committed to doing what it says"

This is an idiom. AT: "with all my being" or "with everything in me" or "sincerely" (See: rc://en/ta/man/translate/figs-idiom)