In the beginning when Hajj was prescribed, people used to trade during Hajj. The narrator then narrated the rest of the tradition upto the words, `season of Hajj’.
Sunan Abi Dawud Book 11, Hadith 15
← Previous Hadith The people used to trade, in the beginning, at Mina, Arafat, the market place of Dhul-Majaz, and during the season of hajj. But (later on) they became afraid of trading while they were putting on ihram. So Allah, glory be to Him, sent down this verse: "It is no sin for you that you seek the bounty of your Lord during the seasons of hajj." Ubayd ibn Umayr told me that he (Ibn Abbas) used to recite this verse in his codex.

Sunan Abi Dawud Book 11, Hadith 14 Next Hadith → she took her child by his arm and lifted him from her litter at the camel. She said Messenger of Allah (SWAS) can this (child) be credited with having performed Hajj. He replied Yes, and you will have a reward.

Sunan Abi Dawud Book 11, Hadith 16