﴿ وَلَئِن سَأَلْتَهُمْ لَيَقُولُنَّ إِنَّمَا كُنَّا نَخُوضُ وَنَلْعَبُ ۚ قُلْ أَبِٱللَّهِ وَءَايَٰتِهِۦ وَرَسُولِهِۦ كُنتُمْ تَسْتَهْزِءُونَ ﴾

“Yet, indeed, if thou wert to question them. they would surely answer, "We were only indulging in idle talk, and were playing [with words]. Say: "Were you, then. mocking at God and His messages and His Apostle?”

Please check ayah 9:66 for complete tafsir.