כִּ֤י אִם־תְּכַבְּסִי֙ בַּנֶּ֔תֶר וְתַרְבִּי־לָ֖ךְ בֹּרִ֑ית נִכְתָּ֤ם עֲוֺנֵךְ֙ לְפָנַ֔י נְאֻ֖ם אֲדֹנָ֥י יְהוִֽה׃
Sekalipun engkau mencuci dirimu dengan natron dan memakai banyak sabun, noda kesalahanmu tetap tampak di hadapan-Ku, demikianlah firman Tuhan Yang Mahakekal.
Rashi
You will look from the peak of Amanah. When I gather your dispersed ones, you will look and ponder what is the reward of your actions from the beginning of your faith [=מֵרֹאשׁ אֲמָנָה that you believed in Me, [e.g.,] your following Me in the wilderness,54See Yirmiyahu 2:22. and your travels and your encampments at My command,55See Bamidbar 9:17-23. and your coming to the peak of Snir and Chermon, which were the lions’ dens, Sichon and Og. Another explanation, “מֵרֹאשׁ אֲמָנָה” [=from the peak of Amanah], this is a mountain on the northern boundary of Eretz Yisroel, named Amanah. In the language of the Mishnah,56Maseches Gittin 8a. [these are] the mountains of Amnon [or] Mount Hor, about which it is stated, “from the Great Sea you shall draw a line extending to Mount Hor.”57Bamidbar 34:7. When the exiles gather and arrive there, they will look from there and see the boundary of Eretz Yisroel and the air of Eretz Yisroel, and they will rejoice and offer thanks. Therefore, it is stated, “תָּשׁוּרִי [=You will sing] from the peak of Amanah.”
Ibn Ezra
שנים Scarlet (comp. Exod. 25:4). The idea contained in this verse is the reverse of that conveyed by the words of Jeremiah, Though thou wash thee with nitre, and take thee much soap, yet thine iniquity is marked before me (Jerem. 2:22); namely, the iniquity will depart, and you will again be free from all sin. The same is expressed by the words Wash you, etc. (ver. 16).
Chidushei Agadot
He said to him, "There is no peace, said the Lord, concerning the wicked": In coming there to the study hall, in which it is the way to seek out the peace of one arriving, the child said this to him, "There is no peace, etc." And the second one said to him, "For though you wash with niter, etc., yet your iniquity is marked, etc." (Jeremiah 2:22). He hinted to him that his repentance would not help him, like the Divine Voice had said, "Return, rebellious children, apart from Acher." And the third one said to him, "And you, spoiled one, what are you doing, etc., that you deck yourself with ornaments of gold, etc.; in vain you make yourself fair" (Jeremiah 4:30) - meaning that even the ornaments and beauty of the Torah that you have will not help you. And similarly did the fourth say, "And to the wicked, God says, 'What is it for you to declare, etc.'" (Psalms 50:16). And this verse is expounded, in the chapter entitled Chelek, about Doeg. And see there in our novella. And this verse chanced upon a child who had a stutter, such that he said it [as if it was with the name of] Elisha, Acher.