Surah Al-Fat'h (The Victory), Verse 4

هُوَ الَّذِیْۤ اَنْزَلَ السَّكِیْنَةَ فِیْ قُلُوْبِ الْمُؤْمِنِیْنَ لِیَزْدَادُوْۤا اِیْمَانًا مَّعَ اِیْمَانِهِمْ وَلِلّٰهِ جُنُوْدُ السَّمٰوٰتِ وَالْاَرْضِ وَكَانَ اللّٰهُ عَلِیْمًا حَكِیْمًا ۟

Huwal lazeee anzalas sakeenata fee quloobil mu'mineena liyazdaadooo eemaanamma'a eemaanihim; wa lillaahi junoodus samawaati wal ard; wa kaanal laahu 'Aleeman Hakeemaa

“It is He Who sent down tranquillity into the hearts of the Believers, that they may add faith to their faith;- for to Allah belong the Forces of the heavens and the earth; and Allah is Full of Knowledge and Wisdom;-”

Quran 48:4 (Yusuf Ali Translation)