I read a hadith that said Prophet Muhammad (PBUH) wanted to burn the houses of those who prayed at home. So this indicated that it is wajib to pray in congregation. I also read another hadith that said the salah of those who hear the azhan but does not come to the mosque will be invalid. But I live in a non-muslim country so there is no azhan here. So I usually pray at home. Will my salah be valid or not?