The Jews were constantly trying to cause harm to the Muslims and search for anyone who could sow dissention among them. For example, during the early months, they exploited the death of Abu Umaamah (As‘ad bin Zuraarah Al-’Ansaari Al-Khazraji), may Allah be pleased with him, who was one of the twelve deputies who gave the pledge to the Prophet in what is known as the Second Pledge of Al-‘Aqabah. He had a disease that caused the face and the body to become red. The Prophet visited him and said twice, “What an exploitable dead man for the Jews. They may [exploit his death] saying that his companion [i.e. Muhammad ] could not treat him while I do not possess for myself any benefit or harm. Nevertheless, I will try to do something that may treat him.” He ordered him to be cauterized on his head with two lines, but he died. Al-Haakim, may Allah be pleased with him, judged this Hadeeth as Saheeh (authentic), which was approved by Ath-Thahabi .
In another narration, “The Prophet cauterized him on the neck in a circular form, but he died. Therefore he said: ‘What an exploitable dead man for the Jews. They will [exploit his death] saying that his companion [i.e. Muhammad ] treated him without any use’”.
This was not the only incident that shed light on the grudge that the Jews held against the Muslims. Immediately after the Hijrah (emigration), they rumored that they had put a spell on the Muslims not to have male children. They did so with the aim of vexing the Muslims and embittering their new life in Madeenah. They also tried to ruin the atmosphere of love and harmony among the Muslims. One would know to what extent this rumor was harmful when he knows how the Muslims rejoiced at having the first male child from the Muhaajroon (emigrants). He was ‘Abdullaah bin Az-Zubayr, may Allah be pleased with him. ’Asmaa’ bint Abu Bakr, may Allah be pleased with her, said