The Three Important Things (Hadith No. 502)
Narrated Jarir bin ‘Abdullah:
I gave the pledge of allegiance to Allah’s Apostle for to offer prayers perfectly, to pay Zakat regularly, and to give good advice to every Muslim.
Mentioning these three things together gives them equal rank in a way.
Offering salah perfectly involves praying on time, making sure your clothes and musalla are clean, praying with khushoo’ and concentration, keeping your intention right and others.
Paying zakah regularly: 2.5% each year.
Giving good advice to every Muslim, irregardless of your relationship with them, whether you get along with them or not etc. Sincerity is an important element.