[If one said,] ‘‘I take upon myself [to bring] an issaron’’ — he brings one; [if he said,] ‘‘essronim’’ — he brings two. [If he said,] ‘‘I specified, but I do not know what I specified’’ — he must bring sixty issaron. [If he said,] ‘‘I take upon myself [to bring] a minchahoffering’’ — he may bring whichever he wishes. R’ Yehudah says: He must bring the minchah of fine flour, for that is the principal minchah-offering.