the Fatwa Department Research Committee - chaired by Sheikh `Abd al-Wahhâb al-Turayrî
It is true that Ibn Taymiyah never married.
As for al-Bukhârî, he did indeed get married. However, he did not have any male children, as mentioned by al-Hâkim in Ma`rifah `Ulûm al-Hadîth.
Sheikh `Abd al-Fattâh Abû Ghuddah discusses the lives of a number of famous scholars who never married in his book al-`Ulmâ’ al-A`zâb (The Bachelor Scholars – first edition published by Maktabah al-Rushd). The following scholars are among those he mentions:
1. `Abd Allah b. Abî Najîh: one of the leading and most prolific commentators of the Qur’ân.
2. Bishr b. al-Hârith al-Hâfî: the famous ascetic.
3. Muhammad b. Jarîr al-Tabarî: the most prominent of all Qur’ân commentators, the author of Jâmi` al-Bayân better known as Tafsîr al-Tabarî.
4. al-Zamakhsharî: the famous scholars of Arabic grammar and rhetoric and the author of the commentary on the Qur’ân entitled al-Kashshâf.
5. Hanâ’ b. al-Sirrî: the famous scholar and ascetic, author of Kitâb al-Zuhd.
6. Abû `Alî al-Qârî: a leading scholar of the Arabic language
7. Abû Sa`d al-Sam`ânî: the author of al-Ansâb, the famous work on genealogy.
8. Al-Nawawî: the leading scholar of Shâfi`î Law, the author of al-Minhâj, a commentary on Sahîh Muslim and of the hadîth compilation Riyâd al-Sâlihîn.
Source: Islam Today