Numbers 13:2

13:2 “Send out men to investigate the land of Canaan, which I am giving to the Israelites. You are to send one man from each ancestral tribe, each one a leader among them.”

Numbers 14:34

14:34 According to the number of the days you have investigated this land, forty days – one day for a year – you will suffer for your iniquities, forty years, and you will know what it means to thwart me.

Numbers 15:39

15:39 You must have this tassel so that you may look at it and remember all the commandments of the Lord and obey them and so that you do not follow after your own heart and your own eyes that lead you to unfaithfulness.