say to them whoever is enemy to gabriel should understand that he has by allahs command revealed to your heart the quran which confirms what was revealed before it and brings guidance and glad tidings to the believers.
قل من كان عدوا لجبريل فإنه نزله على قلبك بإذن الله مصدقا لما بين يديه وهدى وبشرى للمؤمنين