He shall cover thee with his feathers, and under his wings shalt thou trust: his truth shall be thy shield and buckler.
The word picture behind "His truth" is "the mother of the covenant".
In Hebrew this word is made up of the first letter in their alphabet, the middle letter and the last letter.
Revelation 1:8 “I am the Alpha and the Omega, the Beginning and the End,” says the Lord, “who is and who was and who is to come, the Almighty.”
John 14:6 Jesus said to him, “I am the way, the truth, and the life. No one comes to the Father except through Me.