Bid'ah - Newly Invented Matters

Teaching About Bid'aah

Shaykh Muhammad ibn ‘Uthaymeen (may Allah have mercy on him) said: “According to shari’ah, the definition [of bid'aah] is ‘Worshipping Allah in ways that Allah has not prescribed.’ If you wish you may say, ‘Worshipping Allah in ways that are not those of the Prophet (peace and blessings of Allah be upon him) or his rightly guided successors (al-khulafaa’ al-raashidoon).’”

A few resources I came across that I am looking at for creating lessons on the topic of bid'ah, in shaa Allah.
(They are roughly the same in content and layout but there were some differences that I thought I'd like to pull from each of them)