Muslims believe that our body parts will testify our sins in the hereafter. Is that true for donated body parts as well?

Yes, Muslims believe that on the Day of Judgment, people's body parts will testify about their deeds, as mentioned in the Qur'an and Hadith. This belief is extended to donated body parts as well, as they become part of the recipient's body. Here’s an explanation based on Islamic teachings: Qur'anic Evidence Body Parts Testifying Allah mentions in the Qur'an that human body parts will testify against them: Surah Fussilat (41:20-22): "Until, when they reach it (Hellfire), their hearing, their eyes, and their skins will testify against them of what they used to do. And they will say to their skins, 'Why have you testified against us?' They will say, 'We were made to speak by Allah, who has made everything speak, and He created you the first time, and to Him you are returned.' And you were not covering yourselves, lest your hearing, your sight, and your skins testify against you, but you assumed that Allah does not know much of what you do." Everything Will Testify Surah Al-Zalzalah (99:4-5): "On that Day, it (the earth) will report its news, because your Lord has commanded it." This indicates that not only body parts but even inanimate objects, like the earth, will bear witness. Hadith Evidence The Testimony of Limbs The Prophet Muhammad (ﷺ) said: "On the Day of Resurrection, the feet of the son of Adam will not move until he is asked about four things: ... and his body and how he used it." (Tirmidhi, 2417) Accountability of Actions The Prophet (ﷺ) also said: "The hands will speak, and the feet will bear witness to what they used to earn." (Sahih Muslim, 2968) Implications for Donated Body Parts Testimony of the Part's Usage If a body part is donated, it becomes part of the recipient's body and will testify about how it was used by the recipient. This aligns with the principle that every part of the body will be accountable for its actions. The donor will not be held accountable for sins committed using the donated part by the recipient, as individuals are judged for their own actions. Allah says in the Qur'an: Surah An-Najm (53:38-39): "That no bearer of burdens will bear the burden of another. And that there is not for man except that [good] for which he strives." The Donor's Intention The donor's reward or accountability will depend on their intention behind the donation. If it was done sincerely to save a life or benefit another, it is a righteous deed: Surah Al-Ma'idah (5:32): "...whoever saves one [life] – it is as if he had saved mankind entirely."