"Prayer [feeling] heavy and burdensome on a person is an indication of some hypocrisy in his heart..."

Shaikh Muḥammad ibn Ṣāliḥ Al-ʿUthaimīn [Tanbīh Al-Afhām bi Sharḥ ʿUmdah Al-Aḥkām, p. 138]

Shaikh Muḥammad ibn Ṣāliḥ Al-ʿUthaimīn, may Allāh have mercy on him, said:

Prayer [feeling] heavy and burdensome on a person is an indication of some hypocrisy in his heart, so he must hasten to get rid of it.

[Tanbīh Al-Afhām bi Sharḥ ʿUmdah Al-Aḥkām, p. 138.]