Rashi on Exodus 5:16/רש"י על שמות ה׳:ט״ז

1ולבנים אמרים לנו AND BRICKS THEY — the taskmasters — SAY TO US עשו MAKE, just as the former number.

2וְחָטָאת עַמֶּךָ BUT THE FAULT IS IN THINE OWN PEOPLE — If the word וחטאת had the vowel Patach under the ט I would say that it is a noun in the construct state, so that the meaning would be, “and this thing is the sin of thy people” But now, since the vowel is Kametz, it is a noun in the absolute case, and its meaning is as follows: “And this thing brings sin upon thy people”, as though it were written וחטאת לעמך. Sirnilarly we find ל omitted in, (Ruth 1:19) “When they were come בית לחם” which is the same as לבית לחם, to Bethlehem, and there are many similar examples.