Verse 9: (Deut. 31:7, 8, 23) Have not I commanded thee? Be strong and of a good courage; (Ps. 27:1; Jer. 1:8) be not afraid, neither be thou dismayed: for the LORD thy God is with thee whithersoever thou goest.
[Behold, I command, etc.] The particle, הֲלוֹא, is it not that, frequently affirms more strongly, and incites rather than interrogates (Masius, Vatablus). God reassures him, 1. by Divine vocation; 2. by the efficacious presence of God (Junius). I command. Who would not obey God’s command, whose authority is unavoidable, and whose help is invincible (Masius)? Who would fear, with God as companion, indeed, as guide (Lapide)? Have not I commanded? either, by Moses, Deuteronomy 1:38; 31:7, or immediately, Joshua 1:6, 7 (Malvenda).
Have not I commanded thee; I whom thou art obliged to obey; I who can carry thee through every thing I put thee upon; I of whose faithfulness and almightiness thou hast had large experience?
[Be strong] Laws prescribe concerning all things, even concerning courage; Aristotle’s Nicomachean Ethics 5:3 (Grotius).
[Be not afraid] עָרַץ is properly to impel by force, or to shake, or to cause to waver; חָתַת is to break, and to terrify: but here both denote to be confounded and broken in soul (Masius). Dread not, neither be terrified (Vatablus).
 Hebrew: הֲל֤וֹא צִוִּיתִ֙יךָ֙ חֲזַ֣ק וֶאֱמָ֔ץ אַֽל־תַּעֲרֹ֖ץ וְאַל־תֵּחָ֑ת כִּ֤י עִמְּךָ֙ יְהוָ֣ה אֱלֹהֶ֔יךָ בְּכֹ֖ל אֲשֶׁ֥ר תֵּלֵֽךְ׃
 Joshua 1:9b: “Be strong and of a good courage; be not afraid, neither be thou dismayed (אַֽל־תַּעֲרֹ֖ץ וְאַל־תֵּחָ֑ת): for the Lord thy God is with thee whithersoever thou goest.”