So they discussed their strategy among themselves and conferred privately,
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Tafseer
'Abdullāh Ibn 'Abbās / Muḥammad al-Fīrūzabādī
تفسير : (then they debated one with another what they must do) they consulted with one another and decided that if moses defeats them, they will believe in him, (and they kept their counsel secret) from pharaoh.
Jalāl al-Dīn al-Maḥallī
تفسير : so they disputed their matter among themselves, regarding moses and his brother, and kept secret their private counsel, that is, their conversation regarding the two,