משנה על בבא בתרא 5:1

One who possesses two hundred zuz, may not take gleanings” the forgotten sheaf, peah or the poor man’s tithe. If he possesses two hundred minus one denar, then even if a thousand [men] each give him at the same time, he may accept. If he had [two hundred zuz] mortgaged to a creditor or to his wife’s ketubah, he may take. They do not force him to sell his house or his tools.