Reference for Bava Kamma 146:7

אמר רבא עדים שהוכחשו ולבסוף הוזמו נהרגין דהכחשה תחילת הזמה היא אלא שלא נגמרה

as it was impossible for him to utter two terms at the same time, but if he first declared; 'Substitute for a burnt-offering', and then changed his mind and said, 'Substitute for a peace-offering', it will be a substitute for a burnt-offering only.<span class="x" onmousemove="('comment',' Tem. V, 4. ');">⁷</span>

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