The devil laughs from his belly.”(1)

This is a good (ḥasan) hadith.

2950—Al-Ḥasan ibn ʿAlī al-Khallāl narrated to us, saying: Yazīd ibn Hārūn informed us, saying: Ibn Abī Dhi’b informed me, from Saʿīd ibn Abī Saʿīd al-Maqburī, from his father, from Abū Hurayrah, who said: The Messenger of Allah, peace and blessings be upon him, said: “Indeed, Allah loves sneezing and dislikes yawning. So when one of you sneezes and says, ‘Praise be to Allah (al-ḥamdu lillāh),’ it is incumbent upon everyone who hears him to say, ‘May Allah have mercy on you (yarḥamuka Allāh).’ As for yawning—when one of you yawns, let him suppress it as much as he is able, and let him not say, ‘Hāh, hāh,’ for that is only from the devil, and he laughs at him.”(2)

This is a sound (ṣaḥīḥ) hadith.

This is more sound than the hadith of Ibn ʿAjlān, and Ibn Abī Dhi’b is more retentive of the hadith of Saʿīd al-Maqburī and more reliable than Muḥammad ibn ʿAjlān.

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(1) A sound hadith, and this chain is good on account of Muḥammad ibn ʿAjlān.
It was also recorded by Aḥmad (7599), al-Nasāʾī in “ʿAmal al-Yawm wa al-Laylah” (217), Ibn Ḥibbān (2358), al-Ḥumaydī (1161), Ibn Khuzaymah (921), and al-Ḥākim 4/263.
A similar version preceded with the author (370) with the wording: “Yawning in prayer is from the devil; so when one of you yawns, let him suppress it as much as he is able.”

(2) Its chain is sound.
It was also recorded by al-Bukhārī (3289), (6223), and (6226), Abū Dāwūd (5028), al-Nasāʾī in “ʿAmal al-Yawm wa al-Laylah” (214) and (215), Aḥmad (9530), and Ibn Ḥibbān in his “Ṣaḥīḥ” (598).