Verse 19: And it shall be, that whosoever shall go out of the doors of thy house into the street, his blood shall be upon his head, and we will be guiltless: and whosoever shall be with thee in the house, (Matt. 27:25) his blood shall be on our head, if any hand be upon him.
[His blood shall be upon his head] That is, let it be charged against himself (Bonfrerius). He shall be liable for himself (Septuagint). Let his blood return upon his own head (Arabic). Let the cause (or blame [Chaldean]) of his murder return upon his head (Junius and Tremellius). Blood signifies the guilt of shed blood, as in Matthew 27:25. By such a precise description of their duty they show the highest zeal concerning the salvation of Rahab. The more anyone with many conditions and exceptions defines that which he guarantees that he is going to do, the more he shows that it is a matter of concern to him that he not fail. For, those that rashly promise many things, it is commonly of no concern to them that they perform the duty of the promise (Masius). By right of war they fall, who in the captured city do not separate themselves from those resisting (Grotius).
His blood shall be upon his head; the blame of his death shall rest wholly upon himself, as being occasioned by his own neglect or contempt of the means of safety. His blood shall be on our head; we are willing to bear the sin, and shame, and punishment of it.
[If any touch them, אִם־יָ֖ד תִּֽהְיֶה־בּֽוֹ׃] If a hand be upon him (Montanus, Junius and Tremellius), supply, laid (Junius and Tremellius). If any one hurt him (Arabic, similarly the Syriac). They promise more than Rahab stipulated. She had asked life: They restrain all injuries (Masius). If any touch, that is, strike. For no one is guilty of murder because of a simple act of striking. If a hand be upon him, that is, if one kill by the hand. Thus Esther 6:2; Job 1:12 (Drusius).
If any hand be upon him, to wit, so as to kill him, as this phrase is used, Esther 6:2; Job 1:12.
Verse 20: And if thou utter this our business, then we will be quit of thine oath which thou hast made us to swear.
 Hebrew: וְהָיָ֡ה כֹּ֣ל אֲשֶׁר־יֵצֵא֩ מִדַּלְתֵ֙י בֵיתֵ֧ךְ׀ הַח֛וּצָה דָּמ֥וֹ בְרֹאשׁ֖וֹ וַאֲנַ֣חְנוּ נְקִיִּ֑ם וְ֠כֹל אֲשֶׁ֙ר יִֽהְיֶ֤ה אִתָּךְ֙ בַּבַּ֔יִת דָּמ֣וֹ בְרֹאשֵׁ֔נוּ אִם־יָ֖ד תִּֽהְיֶה־בּֽוֹ׃
 Hebrew: וְאִם־תַּגִּ֖ידִי אֶת־דְּבָרֵ֣נוּ זֶ֑ה וְהָיִ֣ינוּ נְקִיִּ֔ם מִשְּׁבֻעָתֵ֖ךְ אֲשֶׁ֥ר הִשְׁבַּעְתָּֽנוּ׃