I think he said for the fifth time: If he drinks it, kill him. Abu Dawud said: And similarly the word “a fifth time” occurs in the tradition of Abu Ghutaif.
أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ بِهَذَا الْمَعْنَى قَالَ وَأَحْسِبُهُ قَالَ فِي الْخَامِسَةِ إِنْ شَرِبَهَا فَاقْتُلُوهُ