מדרש על במדבר 36:3

Speak unto the children of Israel, that they take for me an offering (Exod. 25:2). Whenever the words for Me are stated in a verse, a blessing accompanies it. Does a blessing also accompany an offering? R. Johanan said: Observe what is written in the verse: And they brought yet unto him free-will offerings every morning(baboker baboker)⁵The word morning is repeated in the text to indicate that it must be brought twice at that time. (Exod. 36:3). Why is the word morning repeated in the text? Because they brought all the gifts that were required for the Tabernacle in two mornings. This happened because a blessing accompanied their gifts. Hence it is stated: That they take for Me… ye shall take My offering (Exod. 25:2). They take for Me. The Holy One, blessed be He, said: Because I told you Take for Me an offering, do not scoff at the (giving of an) offering by saying: “He is not a priest that he should eat it,” for if a man fails to give him even one hundredth of his portion, let him realize that he is stealing it, not from the priestly tribe, but from Me, for so it is written: That they take for Me an offering, and ye shall take My offering (Exod. 25:2).