Abu Dawud

Benefits and Issues:
Benefit:
When a sale is conducted according to the principles of Sharia,
the transaction is finalized with certainty,
and one form of deception is eliminated,
then the seller is not, from a legal (shar‘i) perspective, obligated to accept a return.
However, ethics and goodwill demand
that if the other party is not satisfied,
then the transaction should be reversed.
Because the very foundation of trade is mutual consent.
This hadith describes the virtue of the matter mentioned.
Furthermore, the shopkeeper whose merchandise is genuine and honest,
and who has sold it with a reasonable profit,
does not hesitate to accept a return.
Only that shopkeeper refuses to accept a return
whose merchandise is defective or who has sold it at an excessive profit.
Thus, in describing the virtue of accepting a return, there is, indirectly, encouragement for this matter:
that shopkeepers should keep their merchandise genuine,
and sell it with a reasonable profit, so that if someone wishes to return it, there is no hesitation in accepting it.

Benefits and Issues:
➊
The mentioned narration has been declared weak in its chain by our esteemed researcher, whereas other scholars have declared it authentic. For details, see: (al-Irwa’ by al-Albani, no. 1334; al-Sahihah by al-Albani, no. 2614; al-Mawsu‘ah al-Hadithiyyah, Musnad al-Imam Ahmad: 12/401, 402).
Therefore, despite the chain of this narration being weak, it is still valid as evidence and actionable.

➋
If, at the time of transaction, an option is given—meaning, one person says to the other that if you wish, you may cancel the transaction—then, within the period specified, there is the right to annul the sale.

➌
If no such condition was stipulated, and then the buyer wishes to return the purchased item, or the seller takes it back at the same price,
this is a highly meritorious act.

➍
The way a person treats others, Allah Ta‘ala also treats him in the same manner, as is stated in the Prophetic narration:
(Innama yarhamu Allahu min ‘ibadihi al-ruhama’) (Sahih Muslim, al-Jana’iz, Chapter: Weeping over the deceased, Hadith: 923)
“Allah Ta‘ala shows mercy only to those of His servants who are merciful.”

Takhrij:
«أخرجه أبوداود، البيوع، باب في فضل الإقالة، حديث:3460، وابن ماجه، التجارات، حديث:2199، وابن حبان( الموارد)، حديث:1103، 1104، والحاكم:2 /45.»©Explanation:
The aforementioned narration has been declared weak in its chain of transmission (isnad) by our esteemed researcher, whereas other scholars have deemed it authentic (sahih).
Therefore, despite the aforementioned narration being weak in its chain, due to other supporting evidences and corroborating reports, it is acceptable for practice and serves as valid proof.
And Allah knows best.
For details, see: (Irwa’ al-Ghalil, no. 1334; and al-Mawsu‘ah al-Hadithiyyah, Musnad al-Imam Ahmad: 12/401, 402)