Word by Word Analysis

فَعَقَرُوهَا فَقَالَ تَمَتَّعُوا۟ فِى دَارِكُمْ ثَلَـٰثَةَ أَيَّامٍ ۖ ذَٰلِكَ وَعْدٌ غَيْرُ مَكْذُوبٍ 65

But they hamstrung her, so he said, "Enjoy yourselves in your homes for three days. That is a promise not to be denied [i.e., unfailing]."