Surah An-Nisa' (The Women), Verse 104

وَلَا تَهِنُوْا فِی ابْتِغَآءِ الْقَوْمِ اِنْ تَكُوْنُوْا تَاْلَمُوْنَ فَاِنَّهُمْ یَاْلَمُوْنَ كَمَا تَاْلَمُوْنَ وَتَرْجُوْنَ مِنَ اللّٰهِ مَا لَا یَرْجُوْنَ وَكَانَ اللّٰهُ عَلِیْمًا حَكِیْمًا 

Wa laa tahinoo fibtighaaa'il qawmi in takoonoo ta'lamoona fa innahum ya'lamoona kamaa ta'lamoona wa tarjoona minal laahi maa laa yarjoon; wa kaanal laahu 'Aleeman Hakeemaa

“And slacken not in following up the enemy: If ye are suffering hardships, they are suffering similar hardships; but ye have Hope from Allah, while they have none. And Allah is full of knowledge and wisdom.”

Quran 4:104 (Yusuf Ali Translation)