Muwatta Imam Malik Book of Zakat, Hadith 31

Yahya related to me from Malik that he had heard that Abu Bakr as-Siddiq said, "If they withhold even a hobbling cord I will fight them over it."

حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ أَنَّ أَبَا بَكْرٍ الصِّدِّيقَ، قَالَ لَوْ مَنَعُونِي عِقَالاً لَجَاهَدْتُهُمْ عَلَيْهِ .