Sayyiduna Anas bin Malik (may Allah be pleased with him) describes the incident of Badr: When the polytheists drew near, the Messenger of Allah (peace and blessings be upon him) said: "Advance towards Paradise, (a Paradise whose width is equal to the distance between the heavens and the earth) [Surah Al Imran: 133]." Sayyiduna Umayr bin al-Humam al-Ansari (may Allah be pleased with him) said: O Messenger of Allah (peace and blessings be upon him), is its width equal to the expanse between the heavens and the earth? He (peace and blessings be upon him) said: "Yes!" Umayr said: "Bakhin bakhin" (Excellent, excellent). The Messenger of Allah (peace and blessings be upon him) asked: "Why did you say 'Bakhin bakhin' (Excellent, excellent)?" Umayr said: Only out of the hope that I may be among its people. He (peace and blessings be upon him) said: "You are among them." He took some dates out of his pouch and began eating them. Then he said: If I wait until I finish eating these dates, that would be a long life. At once he threw the dates away and fought the enemy until he was martyred.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 17915