Reference for Rosh Hashanah 43:4

<big><strong>גמ׳</strong></big> א"ר לוי מאי טעמא דר"ש דכתיב (שמות יב, א) ויאמר ה' אל משה ואל אהרן בארץ מצרים לאמר החדש הזה לכם עדות זו תהא כשרה בכם

R'SIMEON, HOWEVER, SAYS THAT A FATHER AND SON AND ALL RELATIVES ARE ELIGIBLE TO TESTIFY TO THE APPEARANCE OF THE NEW MOON. R'JOSE SAID: IT HAPPENED ONCE WITH TOBIAH THE PHYSICIAN THAT HE SAW THE NEW MOON IN JERUSALEM ALONG WITH HIS SON AND HIS EMANCIPATED SLAVE, AND THE PRIESTS ACCEPTED HIS EVIDENCE AND THAT OF HIS SON AND DISQUALIFIED HIS SLAVE, BUT WHEN THEY APPEARED BEFORE THE BETH DIN THEY ACCEPTED HIS EVIDENCE AND THAT OF HIS SLAVE AND DISQUALIFIED HIS SON.

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