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
suyuti:3640a –
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السيوطي:٣٦٤٠a –

"اغْتَسِلْ بماءٍ وسِدْرٍ، واحْلِقْ عَنْكَ شعرَ الكفرِ".  

[طص] الطبرانى في الصغير [حل] أبى نعيم في الحلية عن واثلة

See similar narrations below:

Collected by Ṭabarānī, Suyūṭī
tabarani:18493 – Muḥammad b. Idrīs b. Muṭayyab al-Miṣṣīṣī > Sulaym b. Manṣūr b. ʿAmmār from my father > Maʿrūf Abū al-Khaṭṭāb > Wāthilah b. al-Asqaʿ

[Machine] "When I embraced Islam, I went to the Prophet ﷺ and he told me, 'Go and wash with water and sidr (a type of plant) and remove the hair of disbelief from yourself.'"  

الطبراني:١٨٤٩٣ – حَدَّثَنَا مُحَمَّدُ بْنُ إِدْرِيسَ بْنِ مُطَيَّبٍ الْمِصِّيصِيُّ قَالَ ثنا سُلَيْمُ بْنُ مَنْصُورِ بْنِ عَمَّارٍ ثنا أَبِي عَنْ مَعْرُوفٍ أَبِي الْخَطَّابِ عَنْ وَاثِلَةَ بْنِ الْأَسْقَعِ قَالَ

لَمَّا أَسْلَمْتُ أَتَيْتُ النَّبِيَّ ﷺ فَقَالَ لِي «اذْهَبْ فَاغْتَسَلْ بِمَاءٍ وَسِدْرٍ وَأَلْقِ عَنْكَ شَعْرَ الْكُفْرِ»