Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
quran:79:18 –

And say to him, 'Would you ˹be willing to˺ purify yourself  

and say, “Would you — I call you ˹to˺ — purify yourself (tazakkā: a variant reading has tazzakkā, where the original second tā’ ˹of tatazakkā˺ has been assimilated with the zāy), to purge yourself of idolatry, by bearing witness that there is no god but God,
القرآن:٧٩:١٨ –

فَقُلْ هَلْ لَكَ إِلَىٰ أَنْ تَزَكَّىٰ  

{فقل هل لك} أدعوك {إلى أن تزكى} وفي قراءة بتشديد الزاي بإدغام التاء الثانية في الأصل فيها: تتطهر من الشرك بأن تشهد أن لا إله إلا الله.