There are actually a number of passages in God’s inspired Word that show that Jehovah’s loyal servants knew that a future time of resurrection was in store.
يُظْهِرُ ٱلْكِتَابُ ٱلْمُقَدَّسُ أَنَّ خُدَّامًا أَوْلِيَاءَ لِيَهْوَهَ عَرَفُوا أَنَّهُ سَتَحْدُثُ قِيَامَةٌ فِي ٱلْمُسْتَقْبَلِ .‏