Sayyiduna Abdullah bin Abbas (may Allah be pleased with him) once said to his muezzin on a rainy day that after "Ashhadu anna Muhammadur Rasulullah," do not say "Hayya 'ala as-Salah" (come to prayer), but rather say "Sallu fi buyutikum" (pray in your homes). People were surprised at this, so he said: This is what a person better than me (the Messenger of Allah, peace and blessings be upon him) did. Indeed, Jumu'ah is obligatory, but I dislike that I should make you come out of your homes and walk in mud and slippery ground.