Question asked to Al-Allaamah ash-Shaykh Saalih al-Fawzaan (may Allaah preserve him)
Q. Some of the brothers mentioned on you, Oh noble Shaykh, that it is not permissible to make dua against the Jews, especially if that is in a general manner. We hope from you to give clarity?
A. This is the custom of some of the people, and that is that the person cuts off some of the speech and takes what he wants and then says so and so said. This question came during one of the nights: Is it permissible to make dua for the destruction of all of the Kuffaar, the destruction of the Jews, the disbelievers, all of them until the point that none from amongst them remains upon the earth? I said in response: Dua is to be made against the one who transgressed, from amongst them, and oppressed the Muslimeen. As for making dua against them, that all of them be destroyed and none remains from amongst them, Allaah is All-Wise and All-Knowing. He has the ability to destroy them all and not leave anyone remaining except for the Muslimeen. However, Allaah allows them to remain for a wisdom. He allows them to remain for the purpose of striving against them, establishing Al-Walaa (Alliance for the believers) and Al-Baraa (Disassociation from the disbelievers). He allows them to remain so that the difference between the one who loves Allaahand the one who doesn't love Allaah and His Messenger are established. There's wisdom for Allaah in doing that."
Source: Al-Ijaabaat Al-Muhimmah fee Al-Mashaakil Al-Mulimmah Part 2 pgs. 203-204
Sisters Upon Al-Istiqaamah