(Athakasur) 102 : 5
كَلَّا لَوْ تَعْلَمُونَ عِلْمَ الْيَقِينِ

Nay; if you were knowing the Confirmed Knowledge! 

Adhikr, which is the Speech and Three Time Knowledge of Lord, is the “Confirmed Knowledge” as told in verse  69: 51. See explanation 45: 20 and 89: 23-24.