Nehemiah 2:7

2:7 I said to the king, “If the king is so inclined, let him give me letters for the governors of Trans-Euphrates that will enable me to travel safely until I reach Judah,

Nehemiah 2:9

2:9 Then I went to the governors of Trans-Euphrates, and I presented to them the letters from the king. The king had sent with me officers of the army and horsemen.

tn Heb “across the river,” here and often elsewhere in the Book of Nehemiah.