Imam Ali (AS) said, Be sincere when you perform an action [and do it only for the pleasure of Allah].
الإمامُ عليٌّ (عَلَيهِ الّسَلامُ) : أخْلِصُوا إذا عَمِلْتُمْ
Similar narrations
Mīzān al-Ḥikma #3819The Prophet (SAWA) said, ‘If you perform an action, do it sincerely for the sake of Allah because He only accepts from His servants those...