Abu Bakr said, "By Allah! If they (pay me the Zakat and) withhold even a young (female) goat which they used to pay during the lifetime of Messenger of Allah ﷺ, I will fight with them for it." ʿUmar said, "It was nothing but Allah Who opened Abu Bakr's chest towards the decision to fight, and I came to know that his decision was right."  

أَبُو بَكْرٍ ؓ وَاللَّهِ لَوْ مَنَعُونِي عَنَاقًا كَانُوا يُؤَدُّونَهَا إِلَى رَسُولِ اللَّهِ ﷺ لَقَاتَلْتُهُمْ عَلَى مَنْعِهَا قَالَ عُمَرُ ؓ فَمَا هُوَ إِلاَّ أَنْ رَأَيْتُ أَنَّ اللَّهَ شَرَحَ صَدْرَ أَبِي بَكْرٍ ؓ بِالْقِتَالِ فَعَرَفْتُ أَنَّهُ الْحَقُّ