See the article “Do You Need to Learn Hebrew and Greek? ” in the November 1, 2009, issue of The Watchtower.
وَكَيْفَ يَتَأَكَّدُ ٱلَّذِينَ يُعَلِّمُونَ فِي ٱلْجَمَاعَةِ أَنَّ تَعْلِيمَهُمْ مُؤَسَّسٌ عَلَيْهَا ؟‏