Performing Tayammum when there is a valid excuse for not using water

Q: Is it permissible for a person in a state of Janabah (major ritual impurity related to sexual discharge), who has a valid excuse - an illness or an injury - that prevents him from using water in taking Ghusl (ritual bath) to attend the congregational Salah (prayer) in the Masjid (mosque)?

A: All praise be to Allah Alone, and peace and blessings be upon His Messenger, and his family and Companions. If there is an excuse preventing the usage of water for Taharah (ritual purification) (Part No. 5; Page No. 343) from major or minor impurity, then a person is permitted to perform Tayammum (dry ablution with clean earth) and to pray in congregation in the Masjid (mosque).May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.