When Jehovah appointed Joshua to lead the Israelites, He also commanded Moses to “encourage ” and“ strengthen ” Joshua.
وَٱلْيَوْمَ ،‏ يَنْضَمُّ ٱلْمَزِيدُ مِنَ ٱلنَّاسِ إِلَيْنَا فِي عِبَادَةِ يَهْوَهَ .‏