It was narrated by Ibn al-Mundhir and Ibn al-Jārūd with an authentic chain, as recorded in al-Fatḥ. Al-ʿIrāqī likewise declared it sound, as cited in Nayl al-Awṭār, where he writes: “It is established—with the additional word ṭayyibah (wholesome)—through the narration of Anas preserved by Ibn al-Sarrāj in his Musnad,” and he affirms that its chain is authentic.
Al-Shawkānī then remarks: “This indicates that the ‘earth’ mentioned in the report refers to land that is both ritually pure and lawfully permissible, for ground that is defiled is not ṭayyib in the linguistic sense, and land that has been usurped is not ṭayyib according to the law.”
The implicit meaning of the ḥadith, therefore, is that one must avoid foul or polluted ground when praying. Yet neither this report nor the earlier ḥadith of the Bedouin establishes that the purity of the place itself is a condition for the validity of prayer. The discussion here mirrors the debate over whether purity of the body and of one’s clothes is a precondition, a matter whose preferred opinion we have already detailed. I have found no sound proof for those who argue that it is a condition beyond what was mentioned there.
As for the ḥadith of Ibn ʿUmar with the wording, “He forbade prayer in six places…,” which al-Rāfiʿī and the author of al-Muhadhdhab cite in support of that view, its chain is weak and therefore unreliable as evidence, as explained by al-Nawawī and Ibn Ḥajar; we have also critiqued it in Naqd al-Tāj.
For that reason al-Nawawī, after discussing the report, states: “The proof for treating it as a precondition is what has already been cited at the beginning of the chapter; as for the ḥadith mentioned here, it cannot serve as evidence. Among the texts that may be adduced instead is the ḥadith of the Bedouin who urinated in the mosque and the Prophet ﷺ said, ‘Pour a bucket of water over it,’” related by al-Bukhārī and Muslim.