Speak truthfully and kindly; strive to keep your hearts free from negative emotions such as envy or anger; do good deeds for Allah's sake .

This hadith teaches us about the importance of having a pure heart and sincere speech. A pure heart is one that is free from sin, injustice, rancor, or envy. It is important to be honest in our words and actions so that we can be trusted by others. We should strive to always speak truthfully and kindly so that we can build strong relationships with others based on trust. Additionally, it is important to keep our hearts free from negative emotions such as envy or anger as these can lead us astray from doing good deeds for Allah's sake.