´It was narrated from Abu Hurairah that the Messenger of Allah (ﷺ) said:` “When the fierce battles take place, Allah will send a troop of freed slaves who will be the best Arab horsemen and the best armed, with whom Allah will support His religion.”
Hadith Referenceسنن ابن ماجه / كتاب الفتن / 4090
Hadith Gradingالألبانی:حسن | زبیر علی زئی:ضعيف, إسناده ضعيف, عثمان بن أبي العاتكة: ضعفه الجمھور (مجمع الزوائد 10/ 210), انوار الصحيفه، صفحه نمبر 523
Benefits and Issues: (1) Those people who are Muslims generation after generation, in their future generations the love for Islam and the effort to practice it tends to decrease. In contrast, those non-Muslims who accept Islam do so by recognizing its goodness and believing in it wholeheartedly; therefore, they also possess a greater spirit of sacrifice for Islam.
(2) Just as Muslims are preached to practice Islam, it is also necessary—and even more beneficial—to preach to non-Muslims to enter into Islam.
Source: Commentary on Sunan Ibn Mājah by Mawlānā ‘Atā’ullāh Sājid, Page: 4090