Here is a sampling of what I refer to as "God's warnings":
Romans 12:1-2 beseech you therefore, brethren, by the mercies of God, that ye present your bodies a living sacrifice, holy, acceptable unto God, which is your reasonable service. And be not conformed to this world: but be ye transformed by the renewing of your mind, that ye may prove what is that good, and acceptable, and perfect, will of God.
Romans 13:12-14 The night is far spent, the day is at hand: let us therefore cast off the works of darkness, and let us put on the armour of light. Let us walk honestly, as in the day; not in rioting and drunkenness, not in chambering and wantonness, not in strife and envying. But put ye on the Lord Jesus Christ, and make not provision for the flesh, to fulfil the lusts thereof.
Romans 14:13, 19 13 Let us not therefore judge one another any more: but judge this rather, that no man put a stumblingblock or an occasion to fall in his brother's way. ... 19 Let us therefore follow after the things which make for peace, and things wherewith one may edify another.
1 Corinthians 3:10-11 According to the grace of God which is given unto me, as a wise masterbuilder, I have laid the foundation, and another buildeth thereon. But let every man take heed how he buildeth thereupon. For other foundation can no man lay than that is laid, which is Jesus Christ.
1 Corinthians 10:12 Wherefore let him that thinketh he standeth take heed lest he fall.
Galatians 5:13-16 For, brethren, ye have been called unto liberty; only use not liberty for an occasion to the flesh, but by love serve one another. For all the law is fulfilled in one word, even in this; Thou shalt love thy neighbour as thyself. But if ye bite and devour one another, take heed that ye be not consumed one of another. This I say then, Walk in the Spirit, and ye shall not fulfil the lust of the flesh.
Ephesians 4:17, 22, 25-31
17 This I say therefore, and testify in the Lord, that ye henceforth walk not as other Gentiles walk, in the vanity of their mind, ...
22 That ye put off concerning the former conversation the old man, which is corrupt according to the deceitful lusts; ...
25 Wherefore putting away lying, speak every man truth with his neighbour: for we are members one of another.
26 Be ye angry, and sin not: let not the sun go down upon your wrath:
27 Neither give place to the devil.
28 Let him that stole steal no more: but rather let him labour, working with his hands the thing which is good, that he may have to give to him that needeth.
29 Let no corrupt communication proceed out of your mouth, but that which is good to the use of edifying, that it may minister grace unto the hearers.
30 And grieve not the holy Spirit of God, whereby ye are sealed unto the day of redemption.
31 Let all bitterness, and wrath, and anger, and clamour, and evil speaking, be put away from you, with all malice
There are many more warnings ... just giving some examples from the first 4 epistles ...