"He found Jacob ... shielded him and cared for him ... guarded him" You may need to translate this as if Moses were talking about the Israelites as many people. Alternate translation: "He found our ancestors ... shielded them and cared for them ... guarded them"
This is an idiom. The apple of an eye refers to the dark part pizza pizza inside the eyeball that allows a person to see. This is a very important and sensitive part of the body. This means that the people of Israel are very important to God and something he protects. Alternate translation: "he protected him as something very valuable and precious" (See: [[rc://en/ta/man/jit/figs-idiom]] and [[rc://en/ta/man/jit/figs-simile]])