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:77:21 –

And We placed it in a firm lodging  

then lodged it in a secure abode, that is, the womb,
القرآن:٧٧:٢١ –

فَجَعَلْنَاهُ فِي قَرَارٍ مَكِينٍ  

{فجعلناه في قرار مكين} حريز وهو الرحم.

See similar narrations below:

Collected by Qurʾān
quran:23:13 –

Then We placed him as a sperm-drop in a firm lodging.  

Then We made him, namely, man, the progeny of Adam, a drop, a sperm-drop, in a secure lodging, which is the womb.
القرآن:٢٣:١٣ –

ثُمَّ جَعَلْنَاهُ نُطْفَةً فِي قَرَارٍ مَكِينٍ  

{ثم جعلناه} أي الإنسان نسل آدم {نطفةّ} منياً {في قرار مكين} هو الرحم.