Joshua 1:18
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.
Cross-reference
Joshua 1:6 is God's original command to 'be strong and courageous' — the people here repeat it back to Joshua, reinforcing divine encouragement.
Joshua 1:7 also commands 'be strong and very courageous,' linking the people's exhortation to God's earlier charge to keep the law.
Joshua 1:9 again repeats 'be strong and of good courage' — the people's words echo God's own promise of His presence.
Deuteronomy 17:12 prescribes death for defiant rebellion against priest or judge — parallel to the death penalty for rebellion against Joshua.
1 Samuel 11:12 shows Israel wanting to kill those who rejected Saul — same principle of executing rebels against God's appointed leader.
Hebrews 10:29 argues from lesser to greater: if rebellion under Moses meant death, rejecting Christ brings even worse punishment.
Hebrews 12:25 uses the same logic: those who refused an earthly speaker (Joshua/Moses) did not escape, so we face greater danger if we reject God speaking from heaven.
In 2 Samuel 10:12, Joab uses the same phrase 'be of good courage' before battle — directly echoing the people's charge to Joshua.
1 Chronicles 22:13 repeats 'be strong and of good courage' verbatim — David charges Solomon just as Israel charged Joshua.
Hebrews 10:28 cites the death penalty for despising Moses' law, reinforcing the severe consequence for disobedience seen here.
Ezra 10:4 similarly has the people urging a leader to 'be of good courage' and pledging support, paralleling the communal encouragement here.
Luke 19:27 also depicts a king ordering rebels slain, mirroring the same principle of death for rebellion against God's appointed leader.