Jan-12-2009 / Block 170 First transaction Bitcoin: Satoshi Nakamoto sent 10 BTC to Hal Finney.
https://www.blockchain.com/btc/tx/f4184fc596403b9d638783cf57adfe4c75c605f6356fbc91338530e9831e9e16
Oct-12-2009 / Block 24835 First Bitcoin sale to Fiat.
https://www.blockchain.com/btc/tx/7dff938918f07619abd38e4510890396b1cef4fbeca154fb7aafba8843295ea2
Martti Malmi sold 5,050 BTC for $5.02
https://twitter.com/marttimalmi/status/423455561703624704
May-22-2010 / Block 57043 Pizza Day 10,000BTC.
https://www.blockchain.com/btc/tx/a1075db55d416d3ca199f55b6084e2115b9345e16c5cf302fc80e9d5fbf5d48d
Today in the Bitcoin Prehistory thread https://bitcointalksearch.org/topic/m.54483915 I have posted about Pizza Day (without the girl), but this day is always mentioned as the first transaction or purchase of Bitcoin and it is not entirely correct, as always V8 has been fast and has warned me, I already modified the post, now it is better, I did not know it either, but I am glad to know that the first Bitcoin transaction was from Satoshi to Hal Finney.
Thx V8.