Reference for Bava Metzia 65:18

ת"ר העוסקין במקרא מדה ואינה מדה במשנה מדה ונוטלין עליה שכר גמרא אין לך מדה גדולה מזו ולעולם הוי רץ למשנה יותר מן גמרא

AND THEN ASSIST HIS FATHER. IF HIS FATHER AND HIS TEACHER ARE IN CAPTIVITY, HE MUST [FIRST] REDEEM HIS TEACHER AND THEN HIS FATHER. BUT IF HIS FATHER IS A SAGE, HE MUST [FIRST] REDEEM HIS FATHER AND THEN HIS TEACHER.

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