It is not permissible for
someone who has a lisp and does not recite Al-Fatihah (Opening Chapter of the Qur'an) properly to lead others in congregational Salah, unless they also have a lisp. This is because he cannot recite Al-Fatihah correctly, which is one of the pillars of Salah. However, if he can recite Al-Fatihah properly, there is no objection to appointing him as an Imam (the one who leads congregational Prayer). (Part No. 6; Page No. 282) However, it is better to appoint someone else who can recite the Qur’an properly.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.