doth. shall.
commandment. Hebrew "mouth", put by Figure of speech Metonymy (of Cause), for what is uttered by it. See App-6.
commandest. shalt command.
Related Commentaries of Joshua 1:18
Joshua 1:18
18 Whosoever he be that doth rebel against thy commandment, and will not hearken unto thy words in all that thou commandest him, he shall be put to death: only be strong and of a good courage.