Al-Mu'minun 23:66

قَدْ كَانَتْ ءَايَـٰتِى تُتْلَىٰ عَلَيْكُمْ فَكُنتُمْ عَلَىٰٓ أَعْقَـٰبِكُمْ تَنكِصُونَ

Qad kānat āyātī tut'lā ʿalaykum fakuntum ʿalā aʿqābikum tankiṣūna

My verses had already been recited to you, but you were turning back on your heels.