Related for Shabbat 296:14
וכן ערב פסח: א"ר יוחנן מקדיש אדם פסחו בשבת וחגיגתו ביו"ט נימא מסייע ליה וכן ערב פסח בירושלים שחל להיות בשבת מניח טליתו אצלו ונוטל את פסחו ועושה עמו חשבון לאחר יו"ט
— [No.] We treat here of one who assigns shares to others together with himself in his Passover sacrifice,<span class="x" onmousemove="('comment',' Those who participate in the sacrifice must formally enrol themselves as members to share in that particular animal (v. Ex. Xli, 4). Thus the payment is merely for a share in an animal which is already consecrated. ');"><sup>23</sup></span> so that it stands sanctified from before. But we learnt: One may not enrol [to share] in an animal on the Festival in the first place?<span class="x" onmousemove="('comment',' Because it is regarded as transacting business, v. Bez. 27b. ');"><sup>24</sup></span>