عَنِ ابْنِ عُمَرَ رَضِيَ اللَّهُ عَنْهُمَا عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ قَالَ لَئِنْ تَرَكْتُمُ الْجِهَادَ وَأَخَذْتُمْ بِأَذْنَابِ الْبَقَرِ وَتَبَايَعْتُمْ بِالْعِينَةِ لَيُلْزِمَنَّكُمُ اللَّهُ مَذَلَّةً فِي رِقَابِكُمْ لَا تَنْفَكُّ عَنْكُمْ حَتَّى تَتُوبُوا إِلَى اللَّهِ وَتَرْجِعُوا عَلَى مَا كُنْتُمْ عَلَيْهِ
It is narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that the Noble Prophet (peace and blessings be upon him) said: If you abandon jihad, hold onto the tails of cows, and engage in ‘inah (usurious) transactions, Allah the Exalted will impose such humiliation upon your necks that it will not be removed from you until you return to Allah and to the religion which you were bound to.