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
bayhaqi:1482 – Abū ʿAbdullāh al-Ḥāfiẓ > Abū al-ʿAbbās b. Yaʿqūb > al-Ḥasan b. ʿAlī b. ʿAffān > Abū Usāmah > Sufyān > Ibn Abū Najīḥ

[Machine] About Mujahid's saying ﷻ, "And do not approach them until they are pure" [Al-Baqarah 222], "until the bleeding stops" [Al-Baqarah 222], he said, "He (the Messenger of Allah) ﷺ said, 'When they perform ritual ablution.'"  

البيهقي:١٤٨٢ – أَخْبَرَنَا أَبُو عَبْدِ اللهِ الْحَافِظُ ثنا أَبُو الْعَبَّاسِ بْنُ يَعْقُوبَ ثنا الْحَسَنُ بْنُ عَلِيِّ بْنِ عَفَّانَ ثنا أَبُو أُسَامَةَ عَنْ سُفْيَانَ عَنِ ابْنِ أَبِي نَجِيحٍ

عَنْ مُجَاهِدٍ فِي قَوْلِهِ ﷻ {وَلَا تَقْرَبُوهُنَّ حَتَّى يَطْهُرْنَ} [البقرة 222] حَتَّى يَنْقَطِعَ الدَّمُ {فَإِذَا تَطَهَّرْنَ} [البقرة 222] قَالَ يَقُولُ إِذَا اغْتَسَلْنَ  

See similar narrations below:

Collected by Dārimī
darimi:1120 – Muḥammad b. Yūsuf > Sufyān ʿAmman > Mujāhid And Lā Taqrabūhun Ḥattá Yaṭhurn al-Bqrh 222 > Ḥattá Yanqaṭiʿ al-Dam Faʾidhā Taṭahharn al-Bqrh 222

[Machine] From Mujahid, he said: "And do not approach them until they are pure." [Surah Al-Baqarah 2:222] He also said: "Until the bleeding stops." [Surah Al-Baqarah 2:222] He said: "Once they have performed ablution."  

الدارمي:١١٢٠ – أَخْبَرَنَا مُحَمَّدُ بْنُ يُوسُفَ حَدَّثَنَا سُفْيَانُ عَمَّنْ حَدَّثَهُ

عَنْ مُجَاهِدٍ {وَلَا تَقْرَبُوهُنَّ حَتَّى يَطْهُرْنَ} [البقرة 222] قَالَ «حَتَّى يَنْقَطِعَ الدَّمُ» {فَإِذَا تَطَهَّرْنَ} [البقرة 222] قَالَ «إِذَا اغْتَسَلْنَ»