Musar zu Mischlej 22:23

[Likewise,] stealing from the poor person, as it is stated (Proverbs 22:22-23), “Do not rob the indigent for he is indigent; and do not crush the poor man in the gate. For the Lord will take up their cause and despoil those who despoil them of life.” And we have already explained this in the third level. And our Rabbis, may their memory be blessed, said (Bava Kamma 119a) that one who steals from a poor person is as if he takes his life, as it is stated (Proverbs 1:19), “Such is the fate of all who pursue unjust gain; it takes the life of its possessor.” Sometimes it deprives him of his livelihood - even with the theft of less than the value of a perutah (a very small coin). Therefore it is considered like bloodguilt for that person: If he stole the value of a perutah, he has spilled blood.