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la-ʾin basaṭta ʾilayya yadaka li-taqtulanī mā ʾana bi-bāsiṭin yadiya ʾilayka li-ʾaqtulaka ʾinnī ʾakhāfu llāha rabba l-ʿālamīna
Even if you extend your hand toward me to kill me, I will not extend my hand toward you to kill you. Indeed, I fear Allah, the Lord of all the worlds.
— Ali Quli Qarai
Surah Al-Ma'idah, Verse 28
28. "1f you stretch out your hand toward me to slay me, I am not one to stretch out my hand toward you to slay you. Verily, I fear Allah, the Lord of the Worlds."
When confronting a jealous person, you ought to speak with him in a calmly manner, so that you can extinguish the fire of jealousy in him with the calmness of your speech. Thus, one of the ways of 'forbidding from doing evil' is that you assure the evil-doer that you will not transgress him in any way. Abel did not intend to commit homicide. This does not mean that he might not defend himself either, (since submitting to a murderer's will do not adapt to piety).
By the way, refraining from murder because of the awe of Allah (s.w.t.) is a value, not because of disability and weakness. However, piety and God-fearing is the restraining factor from committing sin and transgression in the most sensitive circumstances.