Injil (Arabic: , translit. ʾInjīl, alternative spelling: Ingil) is the Arabic name for what Muslims believe to have been the original Gospel of Jesus (Isa). This Injil is described by the Qur'an as one of the four Islamic holy books which was revealed by God, the others being the Zabur (possibly the Psalms), the Tawrat (the Torah), and the Qur'an itself.
The Arabic word Injil (إنجيل) as found in Islamic texts, and now used also by Muslim non-Arabs and Arab non-Muslims, is derived from the Syriac Aramaic word awongaleeyoon (ܐܘܢܓܠܝܘܢ) found in the Peshitta (Syriac translation of the Bible), which in turn derives from the Greek word euangelion (Εὐαγγέλιον) of the originally Greek language New Testament, where it means "good news" (from Greek "Εὐ αγγέλιον"; Old English "gōdspel"; Modern English "gospel", or "evangel" as an archaism, cf. e.g. Spanish "evangelio")
The general belief held by many Muslims is that the Injil, in Muslim belief, was a scripture authored by Jesus, while more fervent believers claim the author of the Injil was (in Muslim belief) ultimately God, in a manner similar to the way the Quran was revealed to Muhammad: that God inspired Jesus with the verbatim words of the text which were then written by Jesus' hand. Muslims believe that Jesus, who had memorized the revelation, then taught it to all his disciples (al-Hawāriyūn).