鞘安于钝，以护剑利。 （刀鞘保护刀的锋利，它自己则满足于它的迟钝。
The scabbard is content to be dull when it protects the keenness of the sword.
大卫跑去、站在非利士人身旁、将他的刀从鞘中拨出来、杀死他、割了他的头。
Therefore David ran, and stood upon the Philistine, and took his sword, and drew it out of the sheath thereof, and slew him, and cut off his head therewith.
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