مسند اسحاق بن راهويه
Musnad Ishaq bin Rahwiya
كتاب الايمانBook of Faith
Affirmation of the evil and lack of blessing caused by sin
Hadith 61
وَبِهَذَا، عَنْ رَسُولِ اللَّهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ قَالَ: ((مَا تَوَادَّ اثْنَانِ فِي اللَّهِ فِي الْإِسْلَامِ فَيَفْسُدُ ذَلِكَ بَيْنَهُمَا إِلَّا مِنْ ذَنْبٍ يُحَدِثُهُ أَحَدُهُمَا)).
With this same chain, the Messenger of Allah (peace be upon him) said: "When two people love each other for the sake of Allah in Islam, then the committing of a sin by either of them creates discord between them."
