推荐回答（1个）
！、立木为信
春秋战国时，秦国的商鞅在秦孝公的支持下主持变法。当时处于战争频繁、人心惶惶之际，为了树立威信，推进改革，商鞅下令在都城南门外立一根三丈长的木头，并当众许下诺言：谁能把这根木头搬到北门，赏金十两。围观的人不相信如此轻而易举的事能得到如此高的赏赐，结果没人肯出手一试。于是，商鞅将赏金提高到50金。重赏之下必有勇夫，终于有人站起将木头扛到了北门。商鞅立即赏了他五十金。商鞅这一举动，在百姓心中树立起了威信，而商鞅接下来的变法就很快在秦国推广开了。新法使秦国渐渐强盛，最终统一了中国。 ————《史记》--《商君列传》
2、一诺千金
秦末有个叫季布的人，一向说话算数，信誉非常高，许多人都同他建立起了浓厚的友情。当时甚至流传着这样的谚语：“得黄金百斤，不如得季布一诺。”（这就是成语“一诺千斤”的由来）后来，他得罪了汉高祖刘邦，被悬赏捉拿。结果他的旧日的朋友不仅不被重金所惑，而且冒着灭九族的危险来保护他，缍使他免遭祸殃。一个人诚实有信，自然得道多助，能获得大家的尊重和友谊。反过来，如果贪图一时的安逸或小便宜，而失信于朋友，表面上是得到了“实惠”。但为了这点实惠他毁了自己的声誉而声誉相比于物质是重要得多的。所以，失信于朋友，无异于失去了西瓜捡芝麻，得不偿失的。 ————《史记·季布栾布列传》
3、一言九鼎
战国时，秦国的军队团团包围了赵国的都城邯郸，形势十分危急，赵国国君孝成王派平原君到楚国去求援。平原打算带领20名门客前去完成这项使命，已挑了十九名，尚少一个定不下来。这时，毛遂自告奋勇提出要去，平原君半信半疑，勉强带着他一起前往楚国。
平原君到了楚国后，立即与楚王谈及“援赵”之事，谈了半天也毫无结果。这时，毛遂对楚王说：“我们今天来请您派援兵，你一言不发，可您别忘了，楚国虽然兵多地大，却连连吃败仗，连国都也丢掉了，依我看，楚国比赵国更需要联合起来抗秦呀！”毛遂的一席话说得楚王口服心服，立即答应出兵援赵。
平原君回到赵国后感慨地说：“毛先生一至楚，而使赵重于九鼎大吕。”（九鼎大吕：钟名，与鼎同为古代国家的宝器。）
“一言九鼎”和“毛遂自荐”出自同一个典故。平原君夸奖毛遂“一言九鼎”的本意是烘托出他的口才好，演变到现在就成了信守诺言了！
————《史记·平原君列传》
《周本纪》中有烽火戏诸侯
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