you will fail to (keep) it.
certainly we will scatter it
(Moses) said: "Get thee gone! but thy (punishment) in this life will be that thou wilt say, 'touch me not'; and moreover (for a future penalty) thou hast a promise that will not fail: Now look at thy god, of whom thou hast become a devoted worshipper: We will certainly (melt) it in a blazing fire and scatter it broadcast in the sea!"
他说:“你去吧!你这辈子必定常说:不要接触我。你确有一个(受刑的)约期,你绝不能避免它,你看你虔诚住守的神灵吧!我们必定要焚化它,然后必把它撒在海里。