Reference for Rosh Hashanah 50:10

וכיון דתנא ליה ראוהו ב"ד וכל ישראל נחקרו העדים למה לי ה"ק א"נ נחקרו העדים ולא הספיקו לומר מקודש עד שחשיכה הרי זה מעובר

TWO OF THEM SHOULD COME FORWARD AND TESTIFY BEFORE THEM, AND THEN THEY CAN SAY, 'SANCTIFIED, SANCTIFIED'. IF THREE PERSONS SAW IT, THEY [THEMSELVES] CONSTITUTING THE BETH DIN, TWO [OF THEM] SHOULD COME FORWARD AND THEY SHOULD ASSOCIATE SOME OF THEIR COLLEAGUES WITH THE ONE LEFT, AND THEY [THE TWO] SHOULD TESTIFY BEFORE THEM AND THEY CAN THEN SAY, 'SANCTIFIED, SANCTIFIED'.

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