'Mighty men' in the Bible

These be the names of the mighty men that were about David: Josheb of Shebeth the Tahchemonite, first of three, otherwise called Adino the Eznite, which slew eight hundred at one time.

and said, "The LORD forbid that I should do so! Should I drink the blood of men that were in jeopardy of their lives?" And so he would not drink it. These things did these three mighty men.