'Armor bearer' in the Bible

Then said Saul to his armor bearer, Draw your sword, and thrust me through therewith, lest these uncircumcised come and abuse me. But his armor bearer would not; for he was greatly afraid. Therefore Saul took his sword, and fell on it.

When his armor bearer saw that Saul was dead, he likewise fell on his sword, and died.

Zelek the Ammonite, Naharai the Berothite, the armor bearer of Joab the son of Zeruiah,