The Prophet ﷺ said, "Do not intercept goods on their way to the market, do not leave the udders of animals unmilked to deceive buyers, and do not drive up prices for one another by false bidding."
حدثنا هناد حدثنا أبو الأحوص عن سماك عن عكرمة
أن النبي ﷺ قال لا تستقبلوا السوق ولا تحفلوا ولا ينفق بعضكم لبعض
[Hasan]. Ahmad (1/256) also narrated it through Abu Ahwas, but its chain is daif. The hadith has supporting narrations.On this topic there are also narrations from Ibn Masud [Bukhari, no. 2149, and Muslim, no. 1518] and Abu Hurairah [previously mentioned: 1251, 1252].