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:24:2 –

The ˹unmarried˺ woman or ˹unmarried˺ man found guilty of sexual intercourse - lash each one of them with a hundred lashes, and do not be taken by pity for them in the religion of Allah, if you should believe in Allah and the Last Day. And let a group of the believers witness their punishment.  

As for the fornicatress and the fornicator, that is, of those not in wedlock — because those ˹in wedlock˺ are stoned according to the Sunna (the al ˹in al-zāniya, ‘the fornicatress’, and al-zānī, ‘the fornicator’˺ according to some mentioned ˹opinions˺ is a relative ˹particle˺; the clause ˹al-zāniyatu wa’l-zānī˺ is a subject, and because of its similarity to a conditional, the fā’ has been inserted into the predicate, which is ˹the following, fa’jlidū˺): strike each of them a hundred lashes, ˹a hundred˺ strikes (one says jaladahu to mean daraba jildahu, ‘he struck him on the skin’). According to the Sunna, in addition to this ˹punishment˺ there is also banishment for a whole year. The slave, however, receives half of the mentioned ˹punishment˺. And do not let any pity for them overcome you in God’s religion, that is to say, in ˹the fulfilment of˺ His rulings, by disregarding any part of their prescribed punishment, if you believe in God and the Last Day, namely, the Day of Resurrection: in this ˹statement˺ there is an incitement to ˹abide by˺ what was ˹mentioned˺ before the conditional ˹above˺ and it also constitutes the response to the latter, or ˹at least is˺ an indication of the response to it. And let their punishment, the flogging, be witnessed by a group of the believers — some say ˹that this should be a group of˺ three; some say four, as in the number of witnesses testifying to an act of fornication.
القرآن:٢٤:٢ –

الزَّانِيَةُ وَالزَّانِي فَاجْلِدُوا كُلَّ وَاحِدٍ مِنْهُمَا مِائَةَ جَلْدَةٍ ۖ وَلَا تَأْخُذْكُمْ بِهِمَا رَأْفَةٌ فِي دِينِ اللَّهِ إِنْ كُنْتُمْ تُؤْمِنُونَ بِاللَّهِ وَالْيَوْمِ الْآخِرِ ۖ وَلْيَشْهَدْ عَذَابَهُمَا طَائِفَةٌ مِنَ الْمُؤْمِنِينَ  

{الزانية والزاني} أي غير المحصنين لرجمهما بالسنة وأل فيما ذكر موصولة وهو مبتدأ ولشبه بالشرط دخلت الفاء في خبره وهو {فاجلدوا كل واحد منهما مائة جلدة} ضربة يقال جَلَدهُ: ضربَ جلدهُ ويزاد على ذلك بالسنة تغريب عام والرقيق على النصف مما ذكر {ولا تأخذكم بهما رأفة في دين الله} أي حكمه بأن تتركوا شيئا من حدهما {إن كنتم تؤمنون بالله واليوم الآخر} أي يوم البعث في هذا تحريض على ما قبل الشرط وهو جوابه أو دال على جوابه {وليشهد عذابهما} الجلد {طائفة من المؤمنين} قيل ثلاثة وقيل أربعة عدد شهود الزنا.