Say not 'What Allah wills and so-and-so wills', but say 'What Allah wills , then what so-and-so wills'.

This hadith is a reminder to prioritize the will of Allah over all else. It encourages us to remember that whatever we do, it should be in accordance with what Allah has commanded us to do. We should not put our own desires or those of others before what is pleasing to Him. The Prophet Muhammad ﷺ was teaching us that we must always strive to make sure that our actions are in line with His will and commands, no matter how difficult it may be for us at times. We must also remember that even if someone else has a different opinion or desire than ours, we should still strive to follow what is pleasing to Him first and foremost.

This hadith also teaches us about humility and submission; by recognizing that ultimately everything comes from the will of God, we can learn how small and insignificant our own desires are compared to His infinite wisdom and power. We can learn how important it is for us as Muslims to submit ourselves completely before Him, trusting in His perfect plan for each one of us without question or hesitation.