Surah Ali 'Imran — Ayah 160 (3:160)
إِن يَنصُرۡكُمُ ٱللَّهُ فَلَا غَالِبَ لَكُمۡۖ وَإِن يَخۡذُلۡكُمۡ فَمَن ذَا ٱلَّذِي يَنصُرُكُم مِّنۢ بَعۡدِهِۦۗ وَعَلَى ٱللَّهِ فَلۡيَتَوَكَّلِ ٱلۡمُؤۡمِنُونَ ١٦٠
English translation (Saheeh International)
If Allāh should aid you, no one can overcome you; but if He should forsake you, who is there that can aid you after Him? And upon Allāh let the believers rely.
Brief commentary
If Allah supports you with His help and aid, then no one can overcome you, even if everyone in the earth came together against you; yet if He does not help or protect you, then no one can help you after Him. Help is in His Hands alone. So let those who have faith depend on Him and on no one else.