It was as if he were grasping them, and he stretched his arms, keeping them away from his sides.¹

On this topic, there is also a narration from Anas.

The hadith of Abu Humayd is a hasan sahih hadith.

It is what the people of knowledge have chosen: that a man should keep his arms away from his sides during bowing and prostration.

80 — Chapter: What has been reported concerning the glorification (tasbih) during bowing and prostration

260 — ‘Ali ibn Hujr narrated to us, saying: ‘Isa ibn Yunus informed us, from Ibn Abi Dhi’b, from Ishaq ibn Yazid al-Hudhali, from ‘Awn ibn ‘Abdullah ibn ‘Utbah, from Ibn Mas‘ud, that the Prophet, peace and blessings be upon him, said: "When one of you bows and says in his bowing..."

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¹ Sahih, except for his statement: "and he stretched his arms, keeping them away from his sides," which is hasan due to other supporting narrations. It was also recorded as part of a longer hadith by Abu Dawud (734). It is found in Sahih Ibn Hibban (1871). See also what will come at number (304). The practice of keeping the arms away is corroborated by the hadith of Abu Mas‘ud al-Ansari recorded by Abu Dawud (863) and al-Nasa’i 2/186–187. It is in al-Musnad (17076), and its chain is hasan. As for the hadith of Anas mentioned by the author, it was recorded by Ibn Abi ‘Umar al-‘Adani in his Musnad, as found in Ittihaf al-Khayrah (1908), but its chain contains an unidentified man. It was also recorded as part of a longer hadith by Abu Ya‘la (3624) and al-Tabarani in al-Saghir (856), but its chain contains ‘Ali ibn Zayd ibn Jud‘an, who is weak. It was also recorded by Ahmad ibn Mani‘ in his Musnad, as found in al-Matalib al-‘Aliyah (104), but its chain contains al-‘Ala’ ibn Zayd Abu Muhammad al-Thaqafi, who is abandoned. His statement: "and he stretched his arms" — Ibn Sayyid al-Nas said, folio 109: We have narrated it with a shaddah on the second letter of the verb, and its meaning is: he tensed them.