I will not seek the help of a polytheist." (1) And there is more discussion in the hadith than this.

This is a good and authentic (ḥasan gharīb) hadith.

The practice according to some scholars is based on this; they said: no share of the spoils is given to the People of the Covenant (ahl al-dhimmah), even if they fight alongside the Muslims against the enemy.

And some scholars held the view that a share should be given to them if they witness the battle alongside the Muslims.

And it is narrated from al-Zuhrī that the Prophet, peace and blessings be upon him, gave a share to a group of Jews who fought with him.

1643 - Qutaybah ibn Saʿīd narrated to us that, he said: ʿAbd al-Wārith ibn Saʿīd narrated to us, from ʿAzrah ibn Thābit, from al-Zuhrī, with this (2).

1644 - Abū Saʿīd al-Ashajj narrated to us, he said: Ḥafṣ ibn Ghiyāth narrated to us, he said:--------------------------------------------
(1) A sound (ṣaḥīḥ) hadith, narrated in full and abbreviated form by Muslim (1817), Abū Dāwūd (2732), Ibn Mājah (2832), al-Nasāʾī in al-Kubrā (8760), (8761), (8886), and (11600), and it is in al-Musnad (24386), and Ṣaḥīḥ Ibn Ḥibbān (4726).
His saying: "bi-ḥarrat al-wabar" — with the fatḥah on the wāw and the bāʾ, and it is said with sukūn on both: a place between it and Medina, four miles away.
(2) Its narrators are trustworthy, the narrators of the two Shaykhs, but it is mursal (a Successor narrating directly from the Prophet). It was narrated by ʿAbd al-Razzāq (9328) and (9329), Ibn Abī Shaybah 12/395 and 395–396, Abū Dāwūd in al-Marāsīl (281) and (282), al-Bayhaqī 9/53. And regarding al-Zuhrī's mursal narrations, Yaḥyā ibn Saʿīd did not consider them to be anything, saying: "They are like the wind."