Al-Kāfi - The Book of Food

Chapter: Signs of Edible and Inedible Eggs ِنْ أَصْحَابِنَا عَنْ سَهْلِ بْنِ زِيَادٍ عَنْ أَحْ٠َّدِ بْنِ أَبِي نَصْرٍ عَنِ الْعَلَاءِ عَنْ ٠) قَالَ إِذَا دَخَلْتَ أَجَ٠َةً فَوَجَدْتَ بَيْضاً فَلَا تَأْكُلْ ٠َا اخْتَلَفَ طَرَفَاهُ. 1.

A number of our people have narrated from Sahl ibn Ziyad from Ahmad ibn Muhammad from ibn abu Nasr from al-‘Ala’ from Muhammad ibn Muslim who has said the following: “I once asked one of the two Imam, (abu Ja‘far or abu ‘ Abd Allah), ‘Alayhim al-Salam, about the eggs that I may find in the wilderness.

He (the Imam) said, ’Do not eat unless the shape of its both ends is different.’” شهور - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (22/38))