Abu Ayyub (May Allah be pleased with him) reported:
A man said to the Prophet (ﷺ): "Direct me to a deed which may admit me to Jannah." Upon this he (the Messenger of Allah (ﷺ)) said, "Worship Allah and never associate anything with Him in worship, establish Salat, pay Zakat, and strengthen the ties of kinship."[Al-Bukhari and Muslim].
App reference: Book 9, Hadith 221
Arabic/English book reference: Book 9, Hadith 1211