Zayd ibn Hubab narrated from Kamil Abi al-'Ala', similar to the above.¹

This is a gharib hadith.

And thus it has been narrated from 'Ali.

And this is the view of al-Shafi'i, Ahmad, and Ishaq: they hold that this is permissible in the obligatory prayer and the voluntary prayer.

Some narrated this hadith from Kamil Abi al-'Ala' as mursal.

98 - Chapter on what has been reported concerning leaning on the hands

285 - Qutaybah narrated to us, saying: al-Layth narrated to us, from Ibn 'Ajlan, from Sumayy, from Abu Salih, from Abu Hurayrah, who said: The companions of the Prophet, peace and blessings be upon him, complained to the Prophet, peace and blessings be upon him, about the difficulty of prostration for them when they spread themselves out [on their hands], so he said: "Seek help with the knees."²

This hadith is not known to us except from the narration of Abu Salih, from Abu Hurayrah, from the Prophet, peace and blessings be upon him, except through this chain, from the narration of al-Layth, from Ibn 'Ajlan.

And Sufyan ibn 'Uyaynah and others narrated this hadith from Sumayy, from al-Nu'man ibn Abi 'Ayyash, from the Prophet, peace and blessings be upon him, similar to this.

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¹ See the preceding hadith.
² Sahih. Narrated by Abu Dawud (902). It is in al-Musnad (8477) and Sahih Ibn Hibban (1918).