Observe calmness & solemnity when standing up for prayer .

This hadith is about the importance of being calm and solemn when standing up for prayer. The Prophet Muhammad (pbuh) advised us to be mindful of our behavior while praying, as it is a form of worship that should be done with respect and reverence. He also said not to stand up for prayer unless we see him, which means that we should take care to follow his example in our prayers. We should strive to maintain a sense of peace and tranquility while praying, so that we can focus on worshipping Allah without any distractions or disturbances. By doing this, we can ensure that our prayers are accepted by Allah and rewarded accordingly.