Sayyiduna Tamim al-Dari (may Allah be pleased with him) says that the Messenger of Allah (peace and blessings be upon him) said: "This religion will certainly reach wherever the night reaches. Allah will not leave any house, whether of a town or of the desert, but that He will make this religion enter it, through the honour of an honoured one by which Allah will honour Islam, or through the humiliation of a humiliated one by which Allah will humiliate disbelief."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 18619