If an aalim
gave the English Bayaan and Arabic khutbah, but his voice got soft or he got
tired, is it fine if let another suitable person perform the salaah, or is such
an action makrooh?

Answer: 

It is Khilaaf-e-Awla or Makrooh-e-Tanzeehi (undesirable) that the Khutbah is delivered by a particular person and the Salaah led by another, as the Khutbah and Salaah are both considered as one, hence the Fuqaha have written that the same person should carry out both acts.

وَلََ يَنْبَغِي أَنْ يُصَل يَ غَيُْْ الَْْطِيبِ لَِِنَّ الجُْمُعَةَ مَعَ الُْْطْبَةِ كَشَيْءٍ وَاحِدٍ )رد المحتار ص 162 ج 2 )

However, if a person’s voice becomes feint due to sickness or one is extremely tired then due to such a necessity another suitable person may be appointed as the Imaam, but this should not become a continuous habit and practice.

AND ALLAH TA’ALA ALONE IN HIS INFINITE KNOWLEDGE KNOWS BEST

ANSWERED BY: Mufti Mohammed Desai 

CHECKED AND APPROVED BY: Mufti Muhammed Saeed Motara Saheb D.B 

Date: 17 Dhul Qa’dah 1440  English Date: 20 July 2019