What is meant by the slaughtered one?

Question 51: A married man embraced Islaam in the year 1974 and he wants to know who was the son whom Allaah asked His Prophet Ibraaheem (Abraham, peace be upon him) to slaughter as a sacrifice? Was it his son Ismaa‘eel (Ishmael) or Is-haaq (Isaac) (peace be upon them)?

Answer: The Norm of Allaah is that He tests His slaves to distinguish the wicked from the good, to raise the degree of whoever He wants from His Prophets and Awliyaa’ (pious people), and to purify the believers and destroy the disbelievers. Among those who were tried by Allaah was Prophet Ibraaheem (peace be upon him), who was the perfect epitome of compliance in all the trials that Allaah put him through. Allaah (Exalted be He) says: And (remember) when the Lord of Ibraaheem (Abraham) [i.e., Allaah] tried him with (certain) Commands, which he fulfilled. He (Allaah) said (to him), “Verily, I am going to make you an Eemaam (a leader) for mankind (to follow you).” [Ibraaheem (Abraham)] said, “And of my offspring (to make leaders).” (Allaah) said, “My Covenant (Prophethood) includes not Zaalimoon (polytheists and wrongdoers).” He (Exalted be He) praises him, saying: And of Ibraaheem (Abraham) who fulfilled (or conveyed) all that (Allaah ordered him to do or convey):… read more here.