It is narrated from Sayyiduna Yazid bin Shajarah (may Allah be pleased with him) that he said: O people, the world, morning and evening, remains among green, red and yellow, and in the houses there is what there is. So when you meet the enemy, step forward, for the Messenger of Allah (peace and blessings be upon him) said: "No man takes even a single step forward in the path of Allah except that the wide-eyed maidens (hur al-'in) look out towards him; and if he draws back, they feel shy of him and veil themselves from him. Then if he is martyred, the first wound of his blood becomes an expiation for his sins, and two of the wide-eyed maidens descend to him, shake the dust off his face and say: 'Welcome! Now the time has come!' And he says: 'Welcome to you both.'"
Hadith Referenceالمعجم الكبير للطبراني / باب الياء / 18862