In a vision God told Abram, "Do not be afraid, Abram. I am your ___, your very great reward."

Answer: Shield

"Do not be afraid, Abram. I am your shield, your very great reward" (KJV: "thy exceeding great reward").

“After these events, the word of the LORD came to Abram in a vision: “Do not be afraid, Abram. I am your shield, your very great reward.””— Genesis 15:1 (BSB)