Reference for Menachot 159:1
אלא אחליפי תודה נדבה בין לפני כפרה בין לאחר כפרה טעונות לחם מרבה בתודות הוא
Shall I then say [it refers] to the case of what was brought in the place of a freewill thank-offering? But sure whether [it is offered] before the atonement<span class="x" onmousemove="('comment',' Sc. before the sacrifice of the original thank-offering.');"><sup>1</sup></span> or after the atonement it certainly requires the bread-offering, for it is an additional thank-offering!<span class="x" onmousemove="('comment',' Lit., 'he is offering many thank-offerings'. Since the original is a freewill thank-offering there is no obligation to replace it if lost, accordingly what is brought in replacement is in fact another thank-offering, and as such certainly requires the bread-offering.');"><sup>2</sup></span>