By Allah, I will fight whoever distinguishes between prayer and zakat, for zakat is the due owed on wealth. By Allah, if they withheld from me even a young goat that they used to give to the Messenger of Allah ﷺ, I would fight them for withholding it.Umar said, "By Allah, as soon as I saw that Allah had opened Abu Bakr's heart to fighting them, I knew it was the truth."
قال
والله لأقاتلن من فرق بين الصلاة والزكاة فإن الزكاة حق المال والله لو منعوني عناقا كانوا يؤدونها إلى رسول الله ﷺ لقاتلتهم على منعها قال عمر فوالله ما هو إلا أن رأيت أن قد شرح الله صدر أبي بكر للقتال فعرفت أنه الحق