Then Moses went out and spoke these words to all Israel. I'm now 120 years old and I am no longer able to lead you. The LORD has said to me, you shall not cross the Jordan. The LORD your God himself will cross over ahead of you. He will destroy these nations before you, and you will take possession of their land.
Joshua will also cross over ahead of you, as the Lord said. And the Lord will do to them what he did to Sihon and Og, the kings of the Amorites, whom he destroyed along with their land. The LORD will deliver them to you, and you must do to them all that I have commanded you.
Be strong and courageous. Do not be afraid or terrified because of them. For the LORD your God goes with you. He will never leave you or forsake you.
Deuteronomy 31:1 6
Moses sent them out to face the giants in the Promised Land, armed with God's promise, I will never leave you or forsake you. This promise is repeated in Joshua 1:5,3, Joshua 1:9, and in Hebrews 13:5. The same promise is made in different words in various Scriptures. One of my favorites is Isaiah 41:10.
So do not fear, for I am with you. Do not be dismayed, for I am your God. I will strengthen you and help you. I will uphold you with my righteous right hand. Do not fear. Do not be discouraged. God is with you, and he will strengthen and help.