John Gill Commentary Nehemiah 2:7

"Moreover I said unto the king, If it please the king, let letters be given me to the governors beyond the River, that they may let me pass through till I come unto Judah;" — Nehemiah 2:7 (ASV)

Moreover, I said to the king, let letters be given me to
the governors beyond the river
The river of Euphrates, on that side of it towards the land of Judea:

that they may convey me over till I come into Judah ;
furnish him with provisions, and a guard to protect him.