וַאֲנַ֜חְנוּ נֵחָלֵ֣ץ חֻשִׁ֗ים לִפְנֵי֙ בְּנֵ֣י יִשְׂרָאֵ֔ל עַ֛ד אֲשֶׁ֥ר אִם־הֲבִֽיאֹנֻ֖ם אֶל־מְקוֹמָ֑ם וְיָשַׁ֤ב טַפֵּ֙נוּ֙ בְּעָרֵ֣י הַמִּבְצָ֔ר מִפְּנֵ֖י יֹשְׁבֵ֥י הָאָֽרֶץ׃
我們自己卻要迅速武裝起來，走在以色列人的前頭，直到把他們領到他們的地方為止；我們的孩童要因這地的居民的緣故，住在堅固的城裡。
Rashi
ואנחנו נחלץ חשים means, AND WE SHALL ARM OURSELVES SPEEDILY, the last word being the same as in (Isaiah 8:3): “the spoil hasteth, the prey speedeth (חש)” and in (Isaiah 5:19), “Let Him make haste, let Him speed."
Rashbam
חושים, speedy. Compare Psalms 55,9 אחישה מפלט לי, “I would find a refuge speedily.”
Sforno
עד אשר אם הביאונום “as long as we have not brought them, etc.” The construction is similar to Proverbs 8,26 עד לא עשה ארץ וחוצות, “while G’d had not yet made earth nor its attributes.” We also find something similar in Genesis 24,19 עד אם כלו, “until they have finished.”
Or HaChaim
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לפני בני ישראל BEFORE THE CHILDREN OF ISRAEL - i.e. at the head of the troops, because they were mighty men; for thus is it said of Gad, (Deuteronomy 30:20): “He teareth the arm, with the crown of the head”. Moses distinctly stated this to them in Sedrah אלה הדברים (Deuteronomy 3:18): “And I commanded you at that time … Ye shall pass over armed before the children of Israel, all ye men of valour”. And regarding the siege of Jericho it is written, (Joshua 6:13): “And the armed men (החלוץ) went before them”— this refers to the tribes of Reuben and Gad who thus fulfilled the conditions they had laid down.