"A real man should die in front of the ranks, not hide behind a wall!"
大丈夫當陳前死,而入牆閒,豈可得活乎?
Original text (Chinese)
Source, in full
Statement in 191 at Battle of Jieqiao. Yuan Shao and his halberdsmen, surrounded by enemy cavalry, refuses to take refuge. He is said to have thrown off his helmet as he said this. Source: "Yingxiong Ji" (英雄記), page 193-194 of Sanguo Zhi.