Quran 52:31 from Surah At-Tur on Divine Marvels.
قُلۡ تَرَبَّصُواْ فَإِنِّي مَعَكُم مِّنَ ٱلۡمُتَرَبِّصِينَ
English translation: Say Wait for indeed I am with you among those who wait
Transliteration: qul tarabbasu fa-inni ma'akum mina al-mutarabisina