The examples of the aged prophetess Anna and the apostle Paul show that ‘ day and night service ’ implies constancy and earnest effort in the ministry.
(‏ رؤ ٧ :‏ ​ ٩ ،‏ ١٥‏ )‏ وَعَلَامَ تَدُلُّ عِبَارَةُ ‹ ٱلْخِدْمَةِ نَهَارًا وَلَيْلًا › ؟‏