Contradiction with 1 Chronicles 29:28
Joshua 13:1 states Joshua was old, and yet there remained much land to possess, whereas 1 Chronicles 29:28 speaks of David dying in a good old age after having fully fulfilled his purpose.
1 Chronicles 29:28: And he died in a good old age, full of days, riches, and honour: and Solomon his son reigned in his stead.
Contradiction with Philippians 4:13
Joshua 13:1 suggests that there is much land left to possess despite Joshua's advanced age, while Philippians 4:13 indicates that through Christ, one can do all things regardless of age or physical limitations.
Philippians 4:13: I can do all things through Christ which strengtheneth me.