The Prophet ﷺ said: If anyone makes two transactions combined in one bargain, he should have the lesser of the two or it will involve usury.  

قَالَ النَّبِيُّ ﷺ مَنْ بَاعَ بَيْعَتَيْنِ فِي بَيْعَةٍ فَلَهُ أَوْكَسُهُمَا أَوِ الرِّبَا