Reference for Zevachim 65:7
מאי קסבר אי קסבר סמיכת אשם מצורע דאורייתא ותכף לסמיכה שחיטה דאורייתא ליעול ולסמוך להדיא דרחמנא אמר
What does [the Tanna] hold?<span class="x" onmousemove="('comment',' When he rules that shechitah must always immediately follow laying save in the case of a leper.');"><sup>12</sup></span> If he holds that the laying [hands on] the guilt-offering of a leper is a Scriptural requirement, and that [the law that] shechitah must immediately follow laying is Scriptural, then let him [the leper] enter [the Temple court] and lay [hands], since the Divine Law ordained it? - Said R'Adda B'Mattenah: It is a preventive measure, lest he prolong his route.<span class="x" onmousemove="('comment',' Lit., 'take many steps' - into the Temple court - more than is necessary for laying hands. This would not be covered by the Scriptural dispensation.');"><sup>13</sup></span>