When giving Joshua the weighty assignment of leading the Israelites into the Promised Land, Jehovah told him to read the Mosaic Law “day and night ” and to be careful to obey what was written in it.
وَمَا فِي قَلْبِكَ لَهُ أَبْلَغُ ٱلْأَثَرِ فِي ٱلْخِيَارَاتِ ٱلَّتِي تَقُومُ بِهَا وَٱلْأَهْدَافِ ٱلَّتِي تَسْعَى وَرَاءَهَا .‏ —‏ لو ٦ :‏ ٤٥‏ .‏