Abu Ghawth bin Husayn reported,
A man from al-Faraa sought a ruling from the Prophet ﷺ regarding a Hajj that had been due upon his father, who had died without performing it. The Prophet ﷺ said, "Perform Hajj on behalf of your father." The Prophet ﷺ also said, "Likewise, fasting that was vowed is to be made up on his behalf."
Ibn Majah 2905
Daifحدثنا هشام بن عمار حدثنا الوليد بن مسلم حدثنا عثمان بن عطاء عن أبيه
عن أبي الغوث بن حصين
رجل من الفرع أنه استفتى النبي ﷺ عن حجة كانت على أبيه مات ولم يحج قال النبي ﷺ حج عن أبيك وقال النبي ﷺ وكذلك الصيام في النذر يقضى عنه
No references are available.
[Its chain is daif] Bayhaqi (4/335) reported it through the route of Shuayb bin Zurayq, from Ata Khurasani, with the same wording, and said its chain is daif. Busiri and Asqalani also declared it daif (Talkhis 2/225). I say, Ata never heard from Abu Ghawth 
, as stated in Taqrib and elsewhere.