'Assistant' in the Bible

However, Joshua son of Nun, your assistant, will go. Encourage him, because he will enable Israel to inherit the land.

After Moses the Lord's servant died, the Lord said to Joshua son of Nun, Moses' assistant:

Elisha went back and took his pair of oxen and slaughtered them. He cooked the meat over a fire that he made by burning the harness and yoke. He gave the people meat and they ate. Then he got up and followed Elijah and became his assistant.

The fifth time that Sanballat sent his assistant to me in this way, he had an open letter in his hand.

I gave instructions that Shelemiah the priest, Zadok the scribe, and a certain Levite named Pedaiah be put in charge of the storerooms, and that Hanan son of Zaccur, the son of Mattaniah, be their assistant, for they were regarded as trustworthy. It was then their responsibility to oversee the distribution to their colleagues.