Luke 8:15-18 (KJV)
15 But that on the good ground are they, which in an honest and good heart, having heard the word, keep it, and bring forth fruit with patience.
16 No man, when he hath lighted a candle, covereth it with a vessel, or putteth it under a bed; but setteth it on a candlestick, that they which enter in may see the light.
17 For nothing is secret, that shall not be made manifest; neither any thing hid, that shall not be known and come abroad.
18 Take heed therefore how ye hear: for whosoever hath, to him shall be given; and whosoever hath not, from him shall be taken even that which he seemeth to have.
Mormon Temple Secrets Revealed: Endowment
Every secret oath will come to light. No matter if people make blood oaths, God will have it be revealed upon the housetops.