Beitzah 36b Gifting on Shabbat or Yom Tov - מתנה בשבת ויו"ט

Matmonim: Daf Yomi by Rabbi David Lapin - A podcast by Rabbi David Lapin

The Chachamim forbade transfer of ownership on Shabbat and Yomtov. This includes gift-giving. What is the origin of the prohibition and its reasons?Sources