Ibne Abbas (RA) narrates: Rasulullah (Peace be upon him) sent Abdullah ibne Rawaha (RA) with a Jamaat (expedition) on a Friday. His companions set off in the morning, but he decided to stay behind and catch up with them after offering Salat-ul-Jumah (Friday Prayers) with Rasulullah (Peace be upon him). When he did so, he was spotted by Rasulullah (Peace be upon him), who inquired: What prevented you from going out in the morning with your companions. He replied: I wanted to offer Salat-ul-Jumah with you and then join them. He said: If you spend all that is present in the world, you will still not be able to attain the reward and virtues of those who left in the morning.
Source: Hadith from Tirmidhi.
Whenever the opportunity comes to help Islam, we should not delay and immediately take part in helping. Allah has promised great rewards and forgiveness for those who are always the first to sacrifice for Islam.