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Riya’ Insincerity the Sin of the Heart
The heart is the leader of the organs ; if the heart is devoted to piety then the rest of the organs will follow its lead, and consequently, the person will become pious ; likewise, if the heart is corrupted, the rest of the organs will follow in corruption, and consequently, the person will become a sinner. So fear Allâh and work for the Day of Judgement, the day which Allâh described in the Qur’ân as being: « The day where assets and offspring serve no benefit, only the one who has come with a sound heart will profit. »
https://www.islam.ms/en/?p=64
The Sin of Hurting the Parents
Hurting one’s parents immensely (ʿuquq) is among the major sins. Allâh threatened the one who does it with severe torture in Hellfire. This means to harm either or both parents immensely (causing them a lot of pain). Hurting one’s parents is unlawful whether it is severe or light.
https://www.islam.ms/en/?p=56

