Quran 48:4 from Surah Al-Fath on Divine Marvels.
هُوَ ٱلَّذِيٓ أَنزَلَ ٱلسَّكِينَةَ فِي قُلُوبِ ٱلۡمُؤۡمِنِينَ لِيَزۡدَادُوٓاْ إِيمَٰنٗا مَّعَ إِيمَٰنِهِمۡۗ وَلِلَّهِ جُنُودُ ٱلسَّمَٰوَٰتِ وَٱلۡأَرۡضِۚ وَكَانَ ٱللَّهُ عَلِيمًا حَكِيمٗا
English translation: He (is) the One Who sent down [the] tranquility in(to) (the) hearts (of) the believers that they may increase (in) faith with their faith And for Allah (are the) hosts (of) the heavens and the earth and Allah and Allah (is) All-Knower All-Wise
Transliteration: huwa alladhi anzala al-sakinata fi qulubi al-mu'minina liyazdadu imanan ma'a imanihim walillahi junudu al-samawati wal-ardi wakana al-lahu aliman hakiman