יָדוֹ שֶׁל...בָּאֶמְצַע

ביטוי (אנגלית)

Has a hand in the matter

הגדרה (אנגלית)

His hand is involved in the matter. Someone was involved in what happened.

("And any foreign hand involved in the matter is exempt from the firstborn" - Bava Metzia 70b)