that the Messenger of Allah ﷺ said: "When one of you writes something, then let him Yutarrib (smeared with dust to dry the ink) it, for that is more conducive to the need."  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ إِذَا كَتَبَ أَحَدُكُمْ كِتَابًا فَلْيُتَرِّبْهُ فَإِنَّهُ أَنْجَحُ لِلْحَاجَةِ