Sahih Bukhari Volume 8, Book 79, Hadith 6263

وَقَالَ اللَّيْثُ حَدَّثَنِي جَعْفَرُ بْنُ رَبِيعَةَ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ هُرْمُزَ، عَنْ أَبِي هُرَيْرَةَ ـ رضى الله عنه ـ عَنْ رَسُولِ اللَّهِ صلى الله عليه وسلم 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 صلى الله عليه وسلم ‏"‏ نَجَرَ خَشَبَةً، فَجَعَلَ الْمَالَ فِي جَوْفِهَا، وَكَتَبَ إِلَيْهِ صَحِيفَةً مِنْ فُلاَنٍ إِلَى فُلاَنٍ ‏"‏‏

Narrated Abu Hurairah (RA): Allah’s Messenger (pbuh) has mentioned a person from Bani Israel who took a piece of wood, made a hole in it, and put therein one thousand Dinar and a letter from him to his friend. The Prophet (pbuh) said, “(That man) cut a piece of wood and put money inside it and wrote a letter from such and such a person to such and such a person.” [See Hadith No. 2291]