Riyad as-Salihin

'Abdullah bin Mas'ud (May Allah be pleased with him) reported: I asked the Prophet (ﷺ) , "Which of the deeds is loved most by Allah?" Messenger of Allah (ﷺ) said, "Salat at its proper time." I asked, ''What next?" He (ﷺ) replied, ''Kindness to parents." I asked, ''What next?" He replied, ''Jihad in the way of Allah."

[Al-Bukhari and Muslim].