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There are two types of jealousy – protective jealousy and destructive jealousy. Protective jealousy is good. It’s a kind of territorialism which is part of our natural instincts as humans. It’s the kind of jealousy that makes a woman cringe at the mere flirtatious gesture towards her husband, and vice versa. It’s natural. It’s healthy. It’s understandable. 
Destructive jealousy is just what it is – destructive. It’s unnecessary. It’s unhealthy. It’s unacceptable. It’s the kind of jealousy that culminates in evil eyeing, violence and lethal assaults. This is the kind of jealousy that the Prophet (saw) warned us against. He (ﷺ) said, “Do not desert one another, do not nurse hatred towards one another, do not be jealous of one another, and become as fellow brothers and slaves of Allah. It is not lawful for a Muslim to stop talking to his brother for more than three days.” [Al-Bukhari and Muslim]
Allaah enjoined the Prophet himself to pray against jealousy, as He wasn’t free from its harmful effects (Qur’an chapter 113). Whoever finds herself in this form of jealousy should fear Allaah and increase in dhikr and patience. 
Jealousy is not exclusive to the womenfolk but theirs can be really funny. She’s jealous even before there’s anything to be jealous of! She has preconceived jealousy for the second wife her husband is yet to meet, and for the imaginary concubine her husband is not even planning to have! As if that isn’t enough, she’s already jealous of the houris in Jannah! 
Let me just zoom in on this last point… You have no business feeling jealous here because of the houris your husband will be marrying in Jannah. Guess what? There’s no such thing as jealousy in Jannah. The goodies in Jannah described in the Qur’an and Hadiths are just tips of the iceberg. The enjoyment is much more than what any word can describe or what any mind can fathom out. 
You will be too engrossed (in this enjoyment) to even notice the houris around your husband. The kind of pleasure you’ll be feeling on a continuous basis will be much more intense and awesome than orgasms. Your beauty and elegance will be much more than that of the houris. 
So, why don’t you just focus on the entry ticket to Jannah and stop worrying about earthly or heavenly houris? Why don’t you work towards that rare privilege to behold the Face of Allaah and dine in the company of the Prophets, instead of corrupting your “file” with destructive jealousy? 
May Allaah reunite us in Jannah. Aameen.