Messenger of Allah ﷺ mentioned a person from Bani Israel who took a piece of wood, made a hole in it, and put therein one thousand Dinar and letter from him to his friend. The Prophet ﷺ said, "(That man) cut a piece of wood and put the money inside it and wrote a letter from such and such a person to such and such a person."  

عَنْ رَسُولِ اللَّهِ ﷺ أَنَّهُ ذَكَرَ رَجُلاً مِنْ بَنِي إِسْرَائِيلَ أَخَذَ خَشَبَةً فَنَقَرَهَا فَأَدْخَلَ فِيهَا أَلْفَ دِينَارٍ وَصَحِيفَةً مِنْهُ إِلَى صَاحِبِهِ وَقَالَ عُمَرُ بْنُ أَبِي سَلَمَةَ عَنْ أَبِيهِ سَمِعَ أَبَا هُرَيْرَةَ قَالَ النَّبِيُّ ﷺ نَجَرَ خَشَبَةً فَجَعَلَ الْمَالَ فِي جَوْفِهَا وَكَتَبَ إِلَيْهِ صَحِيفَةً مِنْ فُلاَنٍ إِلَى فُلاَنٍ