Prophet Muhammad (ﷺ) is a descendant of Abraham (عليه السلام). This is evident from the Quran:

> ملة **أبيكم** إبراهيم 
>
> [It is] the religion of **your** **father**, Abraham
>
> <sup>— [Quran 22:78](https://quran.com/22/78?translations=20)</sup>

It is also corroborated elsewhere in the Quran, such as:

> [Quran 2:127-129][1] And [mention] when **Abraham was raising the foundations
> of the House** and [with him] **Ishmael,** [saying], "Our Lord, accept
> [this] from us. Indeed You are the Hearing, the Knowing. Our Lord, and
> make us Muslims [in submission] to You **and from our descendants a
> Muslim nation** [in submission] to You. And show us our rites and accept
> our repentance. Indeed, You are the Accepting of repentance, the
> Merciful. Our Lord, and **send among them a messenger from themselves**
> who will recite to them Your verses and teach them the Book and wisdom
> and purify them. Indeed, You are the Exalted in Might, the Wise."
> 
> [Quran 14:37][2] Our Lord, I have settled **some of my descendants**
> in an uncultivated **valley near Your sacred House**, our Lord, that
> they may establish prayer. So make hearts among the people incline
> toward them and provide for them from the fruits that they might be
> grateful.

The above verses establish that the descendants of Ishmael  (عليه السلام) settled around the House (Kaabah) and that a Messenger would be raised from among them who would bring them a Scripture. The Messenger that Abraham  (عليه السلام) prayed for in 2:129 refers to the Prophet Muhammad  (ﷺ) .

> أَنَا دَعْوَةُ أَبِي إِبْرَاهِيمَ 
> 
> I am the supplication of my father Abraham
>
> <sup>— [Saheeh Ibn Hibban](https://shamela.ws/book/1729/9343)</sup>

---

There are several Hadith where the Prophet claimed descent from Abraham  (عليه السلام), among them:

>  قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏ "‏ إِنَّ اللَّهَ اصْطَفَى
> مِنْ وَلَدِ إِبْرَاهِيمَ إِسْمَاعِيلَ وَاصْطَفَى مِنْ وَلَدِ
> إِسْمَاعِيلَ بَنِي كِنَانَةَ وَاصْطَفَى مِنْ بَنِي كِنَانَةَ قُرَيْشًا
> وَاصْطَفَى مِنْ قُرَيْشٍ بَنِي هَاشِمٍ وَاصْطَفَانِي مِنْ بَنِي
> هَاشِمٍ
> 
> The Messenger of Allah said: Allah chose from the **Children of Abraham**:
> Ishmael. And chose from the children of Ishmael: Bani Kananah, and
> from the Bani Kananah He chose the Quraysh, and from the Quraysh He
> chose Bani Hashim, and **He chose me from the Bani Hashim**.
>
> <sub> — [Jami Tirmidhi][6] كتاب المناقب ( Book of virtues ) </sub>


> 
> رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ ‏ "‏ إِنَّ اللَّهَ اصْطَفَى
> كِنَانَةَ مِنْ وَلَدِ إِسْمَاعِيلَ وَاصْطَفَى قُرَيْشًا مِنْ كِنَانَةَ
> وَاصْطَفَى مِنْ قُرَيْشٍ بَنِي هَاشِمٍ وَاصْطَفَانِي مِنْ بَنِي
> هَاشِمٍ ‏"
> 
> The Messenger of Allah said: Verily Allah granted eminence to Kinana
> from amongst the **descendants of Ishmael**, and he granted eminence to
> the Quraish amongst Kinana, and he granted eminence to Banu Hashim
> amongst the Quraish, and **he granted me eminence from the tribe of
> Banu Hashim**.
> 
> <sub> — [Sahih Muslim][7]  كتاب الفضائل  ( Book of virtues ) </sub>




  [1]: https://quran.com/2/127-129
  [2]: https://quran.com/14/37
  [3]: https://quran.com/36/6
  [4]: https://quran.com/6/156
  [5]: http://www.qtafsir.com/index.php?option=com_content&task=view&id=299
  [6]: https://sunnah.com/urn/734660
  [7]: https://sunnah.com/muslim/43/1
  [8]: http://www.chabad.org/library/bible_cdo/aid/8211#showrashi=true
  [9]: http://www.chabad.org/library/bible_cdo/aid/8212#showrashi=true
  [10]: https://judaism.stackexchange.com/questions/89/is-christianity-avodah-zara
  [11]: https://judaism.stackexchange.com/questions/26328/jews-allowed-to-pray-and-join-muslim-congregation-in-mosques-and-experiences/26355#26355