Tosefta do Bawa meci’a 9:14

[If] he did not give [Peah] from the standing grain, he gives from the sheaves. [If] he did not give from the sheaves, he gives from the pile of grain. [If] he did not give from the stack of grain, he gives from the heap (=כרי, see B.M. 9:5), until he [makes it into a] stack (see Peah 1:6), and if he [makes it into a] stack, he tithes it [first] and then gives it [to the poor]