Who held up Moses' arms during the battle with the Amalekites?

So Her and Aaron held up Moses' arms during the battle with the Amalekites. After the victory, Moses built an altar and named it Jehovah Nissi, which means 'I am your banner.' This account is recorded in Exodus chapter 17.

Les teaches that in Exodus chapter 17, after the Amalekites were defeated, Her and Aaron held up Moses' arms. Moses then built an altar and called it Jehovah Nissi, meaning 'I am your banner.' This continues the pattern of God revealing Himself as Jehovah Rapha, the Lord who heals, and later Jehovah Shalom, the Lord is peace, meeting every need of the nation of Israel.

Exodus 17

What did Moses name the altar he built after Israel defeated the Amalekites?

Moses built an altar after Israel defeated the Amalekites and called its name Jehovah Nissi, which the context explains means “I am your banner.” This appears in Exodus chapter 17, following the battle where Aaron and Hur held up Moses’ arms.