Al-Matalib al-'Aliyah 1912 — The martyrs

It is narrated from Abu Bakr bin Hafs bin Umar bin Sa'd (may Allah have mercy on him) that a dispute arose between Sayyiduna Sa'd bin Abi Waqqas and Sayyiduna Talhah bin Ubaydullah (may Allah be pleased with them both) over some property. One day Sayyiduna Talhah (may Allah be pleased with him) came to him and saw that Sayyiduna Sa'd (may Allah be pleased with him) was sitting with his sword drawn from its sheath, resting on his thighs. Sayyiduna Talhah (may Allah be pleased with him) asked: "O Sa'd, for whom have you prepared this sword?" He replied: "For you." Talhah (may Allah be pleased with him) asked: "Would you really have done that?" Sa'd (may Allah be pleased with him) replied: "By the One who sent Muhammad (peace and blessings be upon him) with the truth! I heard the Messenger of Allah (peace and blessings be upon him) saying: 'Whoever fights to protect his wealth or his property and is killed in that struggle is a martyr.'"
Imam Ahmad bin Mani' (may Allah have mercy on him) also recorded this report through Abu Ahmad al-Zubayri from Aban bin Abdullah with the same chain.