Hadith No. 1 of al-Nawawi's collections teaches the importance of

Hadith No. 1 of al-Nawawi's collections teaches the importance of intention (niyyah) in Islam. The Hadith, narrated by Umar ibn al-Khattab (RA), states that the Prophet Muhammad (SAW) said, "Actions are judged by their intentions, and every person will be rewarded according to his intention. Thus, he whose migration was to Allah and His Messenger, his migration was to Allah and His Messenger; and he whose migration was for some worldly benefit or for a woman to marry, his migration was for that which he migrated." This Hadith highlights the significance of having sincere intentions when performing any action in Islam, including acts of worship, daily activities, and interactions with others. It stresses that the intention behind an action is as important as the action itself, and that the reward or punishment for an action depends on the intention behind it. Therefore, a Muslim should always strive to purify their intention and make it solely for the sake of Allah, seeking His pleasure and reward. In summary, Hadith No. 1 of al-Nawawi's collections emphasizes the importance of intention in Islam and encourages Muslims to strive for sincerity in all their actions.