12, 13. (a) How does Ephesians 4: 15, 16 highlight the need to promote unity in the congregation?
١٢ ،‏ ١٣ ‏ (‏ أ )‏ كَيْفَ تُبْرِزُ أَفَسُس ٤ :‏ ​ ١٥ ،‏ ١٦ ٱلْحَاجَةَ إِلَى تَعْزِيزِ ٱلْوَحْدَةِ فِي ٱلْجَمَاعَةِ ؟‏