Those words may have reminded Jewish Christians of the sacrifices that were a feature of their worship before they became followers of Jesus.
فَقَدْ عَرَفُوا دُونَ شَكٍّ أَنَّهُ فِي ظِلِّ ٱلشَّرِيعَةِ ٱلْمُوسَوِيَّةِ ،‏ وَجَبَ أَنْ تَكُونَ ٱلْحَيَوَانَاتُ ٱلْمُقَدَّمَةُ عَلَى مَذْبَحِ يَهْوَهَ أَفْضَلَ مَا لَدَيْهِمْ .‏