Quran 52:12 from Surah At-Tur on Divine Marvels.
ٱلَّذِينَ هُمۡ فِي خَوۡضٖ يَلۡعَبُونَ
English translation: Who [they] in (vain) discourse are playing
Transliteration: alladhina hum fi khawdin yal'abuna