Reference for Keritot 50:21

חמשה אשמות מכפרין אשם תלוי אין מכפר כפרה גמורה

the suspensive guilt-offering does not effect complete atonement;<span class="x" onmousemove="('comment',' If the sin becomes known after the offering of this guilt-offering, an additional sin-offering is required.');">¹¹</span>

Jastrow