Sunan At-Tirmidhi

Narrated 'Abdullah:""I said: 'O Messenger of Allah (ﷺ)! What is the worst sin?' He said: 'That you make and equal to Allah, while it is He who created you.'"" He said: ""I said: 'Then what?' He said: 'That you kill your child fearing that he will eat with you.'"" He said: ""I said: 'Then what?' He said: 'That you commit adultery with your neighbors wife