Hadithcore
Riyad as-Salihin, 1427

Ibn 'Abbas (May Allah be pleased with them) reported:

The Messenger of Allah (ﷺ) said: "Glorify your Lord in Ruku' (bowing posture) and exert yourself in supplication in prostration. Thus your supplications are liable to be accepted." <b>[Muslim]</b>.

وعن ابن عباس رضي الله عنهما أن رسول الله صلى الله عليه وسلم قال‏:‏ ‏

‏ فأما الركوع فعظموا فيه الرب، وأما السجود فاجتهدوا في الدعاء، فقمن أن يستجاب لكم‏

‏ ‏(‏‏(‏رواه مسلم‏)‏‏)‏‏.‏

References1 variant
In-Book Reference
Book 15, Hadith 20
Sharh · explanationclick to expand
<b>Guidance from the Hadiths:</b><br> 1) It is impermissible to recite the Qur’an during bowing or prostration. In fact, bowing is meant for glorifying and praising Allah Almighty, while prostration is meant for supplicating Allah and asking Him for what one wishes for.<br> 2) The slave is closest to His Lord when he is prostrating himself for Him, so he should avail himself of this opportunity and make as much supplication as he can.<br> 3) Bowing implies the slave’s perfect reverence to Allah Almighty, while prostration implies showing full humbleness to Him. Thus, the slave combines humbleness of appearance and the humility of entreating His Lord.