Ask him and his family to go with you and your family to preach in unassigned or seldom - worked territory.
اُدْعُهُ وَعَائِلَتَهُ إِلَى مُرَافَقَتِكَ أَنْتَ وَعَائِلَتِكَ فِي ٱلْخِدْمَةِ فِي مُقَاطَعَةٍ غَيْرِ مُعَيَّنَةٍ لِأَيَّةِ جَمَاعَةٍ أَوْ نَادِرًا مَا تُغَطَّى .‏