Are sales with great uncertainty (gharar) haram?

Haram Money & business Hadith · 1

Short answer

Yes. The Prophet ﷺ forbade sales that involve gharar, meaning excessive uncertainty or risk about the goods or the price. Scholars distinguish major gharar, which spoils a contract, from tiny uncertainty that is tolerated.

Evidence

Hadith

1 Sahih Muslim 1513

Abu Huraira (Allah be pleased with him) reported that Allah's Messenger (ﷺ) forbade a transaction determined by throwing stones, and the type which involves some uncertainty

Arabic text (with chain of narrators)

وَحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا عَبْدُ اللَّهِ بْنُ إِدْرِيسَ، وَيَحْيَى بْنُ سَعِيدٍ، وَأَبُو أُسَامَةَ عَنْ عُبَيْدِ اللَّهِ، ح وَحَدَّثَنِي زُهَيْرُ بْنُ حَرْبٍ، - وَاللَّفْظُ لَهُ - حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ، عَنْ عُبَيْدِ اللَّهِ، حَدَّثَنِي أَبُو الزِّنَادِ، عَنِ الأَعْرَجِ، عَنْ أَبِي هُرَيْرَةَ، قَالَ نَهَى رَسُولُ اللَّهِ صلى الله عليه وسلم عَنْ بَيْعِ الْحَصَاةِ وَعَنْ بَيْعِ الْغَرَرِ ‏.‏

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This is general information, not a fatwa. For your own situation, ask a qualified scholar.