His words, Exalted is He:

We have assuredly given you Abundance [al-Kawthar].

He said:

When al-Qāsim died in Mecca and Ibrāhīm in Medina, the Quraysh said that Muḥammad ﷺ had become heirless.^{1lit. ‘cut off’ (abtar).} He was angered by this. Then the verse came down, We have assuredly given you Abundance, [that is], ‘We are consoling him and compensating him with Abundance (al-Kawthar).’^{2The MSS are at variance concerning the form of the verb here: MSS Z515, f. 142a has tuʿazzīhi. While F3488, f. 352b has taʿziya, and F638, f. 70b has yuʿazzīhi. However Z515 uses the first person plural form of the verb that follows (nuʿawwiḍuhu), and the sentence that follows relates to God in the first person (idhnī), so it is logical to suppose that the first person might also apply to the first verb.} ‘[Al-Kawthar] is a pool from which you can give whomever you wish a drink, with My permission, and refuse whomever you wish a drink from it, with My permission.’^{3Al-Kawthar, which literally means ‘abundance’, is also the name for a river or pool in Paradise, or alternatively the river which feeds the Pool (al-ḥawḍ), at which the believers, on entering Paradise, will quench their thirst. See al-Ghazālī, Iḥyāʾ ʿulūm al-dīn, Kitāb Dhikr al-mawt, trans. Winter, pp. 217–8. Note that Tustarī identifies al-Kawthar itself with al-ḥawḍ.}

So pray to your Lord and make your sacrifice to Him Indeed it is your antagonist who is cut off,

from the good of both abodes.^{1That is, the good of this world and of the Hereafter. Having used the word abtar in his commentary on verse 1 in its meaning of ‘being without an heir’, Tustarī now interprets the word abtar more literally as ‘cut off’.}