From Commentary: If the people doubted that He was their Creator all they had to do was look back into their history (Remember the days of old, v. 7). The challenge to remember is given 16 times in Deuteronomy, starting in 4:10 and concluding here.  Jack S. Deere, “Deuteronomy,” in The Bible Knowledge Commentary: An Exposition of the Scriptures, ed. J. F. Walvoord and R. B. Zuck, vol. 1 (Wheaton, IL: Victor Books, 1985), 318. How would one search for the 16 times "the challenge to remember" is given in Deuteronomy 4:10-32:9?
  1. I would suggest a word search for the Hebrew work for remember. Right click on the work and choose the lemma option on the left. Then, on the right, choose the search option. You can refine by a morph search by adding @ behind the word. Choose “verb” to focus on the action of remembering. Since both imperatives and participles can be translated as commands to remember, choose both of these options. You can further limit the results by setting the range to only Deuteronomy. Hope this helps!

  2. Or simply search for the word remember constrained to the book of Deuteronomy

  3. Thank you, both!