וְלֹ֣א תִהְיֶ֣ה זֹ֣את ׀ לְךָ֡ לְפוּקָה֩ וּלְמִכְשׁ֨וֹל לֵ֜ב לַאדֹנִ֗י וְלִשְׁפָּךְ־דָּם֙ חִנָּ֔ם וּלְהוֹשִׁ֥יעַ אֲדֹנִ֖י ל֑וֹ וְהֵיטִ֤ב יְהוָה֙ לַֽאדֹנִ֔י וְזָכַרְתָּ֖ אֶת־אֲמָתֶֽךָ׃ (ס)
então, meu SENHOR, não terás no coração esta tristeza nem este remorso de teres derramado sangue sem causa, ou de haver-se vingado o meu SENHOR a si mesmo. E quando o SENHOR fizer bem a meu SENHOR, lembra-te então da tua serva.
Rashi
it does not bend Heb. יפיק, it does not kneel with its knees. Comp. (I Sam. 25:31) “a stumbling block (פוקה)”; (Nahum 2:11) “and tottering (ופיק) of the knees.”
Ramban
THEN MOSES AND AARON FELL ON THEIR FACES. The reason for this was that they saw that the people were about to decide to appoint a leader and return [to Egypt] immediately; so the righteous ones [Moses and Aaron] arose and prostrated themselves with their faces on the ground saying to them, ‘I pray you, my brethren, do not so wickedly,’96Genesis 19:7. and let this be no stumbling-block unto you.97See I Samuel 25:31. Therefore it says [that they fell on their faces] before all the congregation of the children of Israel, for it was for their sake that they prostrated themselves on their faces [imploring them to abandon their plan to return to Egypt].98Ramban here is excluding the possibility of interpreting their falling on their faces as a preparation for prayer (see further, 16:22). Therefore he points out that here it says that they [fell on their faces] before all the assembly of the congregation of the children of Israel, thus indicating that they did so in order to implore them to abandon their plan of returning to Egypt. See also Note 155 further. Similarly, and he [David] fell on his face to the ground and bowed down three times99I Samuel 20:41. [before Jonathan, is an expression of conciliation and supplication]. And the meaning of the word liphnei [“before” — ‘before’ all the assembly] is like lahem [“for them” — to implore them, for their good, to renounce their plan of returning to Egypt]. Similarly, And his brethren also went and fell down ‘l’phanav (‘before’ him)100Genesis 50:18. Here too, it could not mean that the brothers did so in order “to pray” to Joseph, but only to plead with him on their behalf. [also means “to” him — Joseph — to beg him for forgiveness]. There are many examples of this usage.
Rashi
פָּקוּ is an expression similar to (Nahum 2:11), “The stumbling (פִּיק) of knees”; (I Sam. 25:31) “A stumbling block (פּוּקָה).”
Rashi
the knees stumble Heb. וּפִק, the stumbling of the knees, as, in (I Sam. 25:31) “As a stumbling block and a remorse.”