This would depend on how one views God "saying" something. Do you mean a direct quote of the Lord speaking, or a verse from the Bible itself (God's Word)?
If we look for word-for-word quotes by the Lord Himself, there are none that explicitly state what the fallen angels were guilty of, hence the difficulty there. However, looking through Scripture there is one place that comes to mind:
We find a Scriptural reference to the angels "falling", and what they did to do so, in Genesis 6:2 & 4
2 That the sons of God saw the daughters of men that they were fair; and they took them wives of all which they chose.
4 There were giants in the earth in those days; and also after that, when the sons of God came in unto the daughters of men, and they bare children to them, the same became mighty men which were of old, men of renown.
Revelation is also used, however John is told the War in Heaven is an event "to come", which eliminates it as a possibility, being so far in to the Tribulation period.
If you've read the Book of Enoch and consider it Scriptural (as Athenagoras, Clement of Alexandria, Irenaeus and Tertullian all wrote it was), then we have more detail:
1 Enoch 7:1-2
1 It happened after the sons of men had multiplied in those days, that daughters were born to them, elegant and beautiful. 2 And when the angels, the sons of heaven, beheld them, they became enamoured of them, saying to each other, "Come, let us select for ourselves wives from the progeny of men, and let us beget children."
As well as Chapter 8:
Moreover Azazyel taught men to make swords, knives, shields, breastplates, the fabrication of mirrors, and the workmanship of bracelets and ornaments, the use of paint, the beautifying of the eyebrows, the use of stones of every valuable and select kind, and of all sorts of dyes, so that the world became altered. Impiety increased; fornication multiplied; and they transgressed and corrupted all their ways. Amazarak taught all the sorcerers, and dividers of roots: Armers taught the solution of sorcery; Barkayal taught the observers of the stars; Akibeel taught signs; Tamiel taught astronomy; And Asaradel taught the motion of the moon. And men, being destroyed, cried out; and their voice reached to heaven.
This, of course, depends on if you consider the book. If not, then only Genesis 6:2 & 4 gives us an idea of why the angels fell - they lusted for the daughters of men.
In regards to Satan, the Hebrew Bible only personifies him in 3 places - an accuser in Zechariah 3:1-2, a seducer in 1 Chronicles 21:1, and a heavenly persecutor in Job 2:1. This is also in line with his only appearance in the New Testament where he attempts to tempt Christ. He is always inferior to God, always under God's command, and almost always in Heaven - this paired with him never being described as such eliminates him as being an angel, let alone fallen. The Oxford Dictionary of the Jewish Religion ascribes this idea to a misinterpretation of Isaiah 14:12.
- Genesis & 1 Enoch
- The Oxford Dictionary of Jewish Religion
- Hermeneutics, Intertextuality and the Contemporary Meaning of Scripture
- "Lucifer" - The Jewish Encyclopedia