al-Sunan al-Kubra (al-Bayhaqi) 11770
✧ Hiring is not valid until it is known and the wage is known
وَكَانَ ابْنُ عَبَّاسٍ ؓ لَا يَرَى بَأْسًا أَنْ يَدْفَعَ الرَّجُلُ إِلَى الرَّجُلِ الثَّوْبَ، فَيَقُولُ: بِعْهُ بِكَذَا وَكَذَا، فَمَا زِدْتَ فَهُوَ لَكَ
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No grade is recorded for this wording.