Performing Salah with the trousers below the ankles.
In the name of Allah, the most Beneficent, the most Merciful.
Saaiduna Mughirah Bin Shubah Radiallahu Anhu said: “I saw the Prophet of Allah Sallallahu Alahi Wasalam, seized the wrap of Sufyan Bin Suhail, saying: ‘O Sufyan do not lower garments below the ankles, verily Allah detests those who lower their garments below the ankles. (Sunan Ibn Majah, Sunan Nasai and Sahih Ibn Hibban)
Saaiduna Abu Hurairah narrates that: “A man was praying with his garment below his ankles when the Prophet of Allah Sallallahu Alahi Wasalam said: ‘Go and repeat your Wudu.’ So the man went and did his Wudu and returned. The Prophet of Allah Sallallahu Alahi Wasalam said: ‘Go and repeat your Wudu.’ So the man went and repeated his Wudu and returned. The man asked: ‘O Prophet of Allah what is it that you told him to do Wudu (again) and then you did not say anything?’ The Prophet of Allah Sallallahu Alahi Wasalam said: ‘He was praying with his garment below his ankles, verily Allah does not accept the prayer of a man who lowers his garments.’ (Sunan Abi Dawud p.100 v.1)
With regards to your question, it is Makruh Tahrimi to perform salah with the trousers or jubbah below the ankles; however, the obligation (fardhiyat) will be done. (Fatawa Darul Uloom Deoband p.127 v.4)
Only Allah Knows Best
Mohammed Tosir Miah
Darul Ifta Birmingham.