Adam Clarke on Isaiah 31:7

Which your own hands have made unto you for a sin "The sin, which their own hands have made" - The construction of the word חטא chet, sin, in this place is not easy. The Septuagint have omitted it: MSS. Pachom. and 1. D. 2 and Cod. Marchal. in margine, supply the omission by the word ἁμαρτιαν, sin, or ἁμαρτημα, said to be from Aquila's Version, which I have followed. The learned Professor Schroeder, Institut. Ling. Hebrews p. 298, makes it to be in regimine with ידיכם yedeychem, as an epithet, your sinful hands. The Septuagint render the pronoun in the third person, αἱ χειρες αυτων, their hands; and an ancient MS. has, agreeable to that rendering, להם lahem, to them, for לכם lachem, to you; which word they have likewise omitted, as not necessary to complete the sense.