A man reported,

I asked Ibn Umar, "I am only asking you about two matters, about advance payment for dates on the palm and about combining raisins and dates."He said, "A man was brought to the Messenger of Allah ﷺ who was intoxicated, having drunk a mixture of raisins and dates. He flogged him with the prescribed punishment and forbade that the two be combined.A man made an advance payment for the dates on another man's palm trees, but his trees did not bear fruit. He came demanding his payment back, but the other refused to return it. The two of them came to the Prophet ﷺ, who asked, 'Did your palm trees bear fruit?'He replied, 'No.'The Prophet ﷺ said, 'Then on what basis are you consuming his wealth?' He ordered him to return it, and forbade advance payment for dates on the palm until their soundness becomes apparent."

حدثنا محمد بن جعفر حدثنا شعبة سمعت أبا إسحاق

سمعت رجلا من أهل نجران قال

سألت ابن عمر قلت إنما أسألك عن شيئين عن السلم في النخل وعن الزبيب والتمر فقال أتي رسول الله ﷺ برجل نشوان قد شرب زبيبا وتمرا قال فجلده الحد ونهى أن يخلطا قال وأسلم رجل في نخل رجل فلم يحمل نخله قال فأتاه يطلبه قال فأبى أن يعطيه قال فأتيا النبي ﷺ فقال أحملت نخلك قال لا قال فبم تأكل ماله قال فأمره فرد عليه ونهى عن السلم في النخل حتى يبدو صلاحه