Show kindness and compassion in all our actions.

In this hadith, the Prophet Muhammad (PBUH) is teaching us about the importance of mercy and compassion. He asked Allah to have mercy on those who shave or shorten their hair. This shows us that even small acts of kindness can be rewarded by Allah with His mercy and compassion. We should strive to show kindness and compassion in all our actions so that we may receive His blessings in return. Additionally, this hadith also teaches us about the importance of being humble and not taking ourselves too seriously; even something as seemingly insignificant as shaving or shortening one's hair can be seen as an act worthy of reward from Allah if done with humility and sincerity.