B1noun
يَقِينٌ
yaqīn
certainty / absolute conviction
Example
وَاعْبُدْ رَبَّكَ حَتَّى يَأْتِيَكَ الْيَقِينُ
waʿbud rabbaka ḥattā yaʾtiyaka al-yaqīn
And worship your Lord until the certainty comes to you (15:99)
Grammar
Masculine noun. Related: مُوقِنٌ (one who has certainty), أَيْقَنَ (to be certain). Three levels in the Quran: عِلْمُ الْيَقِينِ (knowledge of certainty), عَيْنُ الْيَقِينِ (eye of certainty), حَقُّ الْيَقِينِ (truth of certainty).
Culture
Al-yaqīn here is interpreted by most scholars as death - meaning one should worship God throughout life until death. The three levels of yaqīn represent ascending stages of spiritual realization.