Sahih al-Bukhari, Volume 8, Book 74, Hadith 277 (USC-MSA) ⓘ

Narrated Abu Sufyan bin Harb: that Heraclius had sent for him to come along with a group of the Quraish who were trading in Sha'm, and they came to him. Then Abu Sufyan mentioned the whole narration and said, "Heraclius asked for the letter of Allah's Messenger. When the letter was read, its contents were as follows: 'In the name of Allah, the Beneficent, the Merciful. From Muhammad, Allah's slave and His Apostle to Heraclius, the Chief of Byzantines: Peace be upon him who follows the right path (guidance)! Amma ba'du (to proceed )...' (See Hadith No 6, Vol 1 for details)

حَدَّثَنَا مُحَمَّدُ بْنُ مُقَاتِلٍ أَبُو الْحَسَنِ، أَخْبَرَنَا عَبْدُ اللَّهِ، أَخْبَرَنَا يُونُسُ، عَنِ الزُّهْرِيِّ، قَالَ أَخْبَرَنِي عُبَيْدُ اللَّهِ بْنُ عَبْدِ اللَّهِ بْنِ عُتْبَةَ، أَنَّ ابْنَ عَبَّاسٍ، أَخْبَرَهُ أَنَّ أَبَا سُفْيَانَ بْنَ حَرْبٍ أَخْبَرَهُ أَنَّ هِرَقْلَ أَرْسَلَ إِلَيْهِ فِي نَفَرٍ مِنْ قُرَيْشٍ وَكَانُوا تِجَارًا بِالشَّأْمِ، فَأَتَوْهُ فَذَكَرَ الْحَدِيثَ قَالَ ثُمَّ دَعَا بِكِتَابِ رَسُولِ اللَّهِ صلى الله عليه وسلم فَقُرِئَ فَإِذَا فِيهِ ‏ "‏ بِسْمِ اللَّهِ الرَّحْمَنِ الرَّحِيمِ، مِنْ مُحَمَّدٍ عَبْدِ اللَّهِ وَرَسُولِهِ إِلَى هِرَقْلَ عَظِيمِ الرُّومِ، السَّلاَمُ عَلَى مَنِ اتَّبَعَ الْهُدَى، أَمَّا بَعْدُ ‏" ‏‏.‏

Narrated Abu Hurairah (ra): Allah's Messenger 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 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."

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 ‏" ‏‏.‏