Concerning the Lord's second coming:

2 Peter 3:10

"But the day of the Lord will come as a thief in the night; in the which the heavens shall pass away with a great noise, and the elements shall melt with fervent heat, the earth also and the works that are therein shall be burned up. Seeing then that all these things shall be dissolved, what manner of persons ought ye to be in all holy converstion and godliness, Looking for and hasting unto the coming of the day of God wherein the heavens being on fire shall be dissolved, and the elements shall melt with fervent heat? Nevertheless we, according to his promise, look for new heavens and a new earth, wherein dwelleth righteousness."

I also like the scripture:

D&C 64:23

"Behold, now it is called today until the coming of the Son of Man, and verily it is a day of sacrifice, and a day for the tithing of my people; for he that is tithed shall not be burned at his coming. For after today cometh the burning - this is speaking after the manner of the Lord - for verily I say, tomorrow all the proud and they that do wickedly shall be as stubble; and I will burn them up, for I am the Lord of Hosts; and I will not spare any that remain in Babylon. Wherefore, if ye believe me, ye will labor while it is called today."