It was narrated from Abu Qatadah Al-Ansari that he heard the Messenger of Allah say: "Beware of taking oaths a great deal when selling, for it may help you to make a sale but it destroys the blessing".
The Prophet Muhammad ﷺ was teaching us here about being mindful of our words and actions, especially when engaging in business transactions. He was reminding us that although taking an oath may seem like a good idea at the time, it can actually have negative consequences in the long run if done too often or without thoughtfulness. We must always strive for balance between making sales and maintaining blessings from Allah by avoiding any action which could potentially lead to their destruction.