All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.
Putting the hand on the Mus-haf is not considered a vow, and it does not necessitate an expiation or the like; for more benefit, please refer to Fatwa 82501.
However, it should be mentioned that it is not permissible for a Muslim to desert his Muslim brother more than three nights unless he has a sound reason as confirmed in the Sunnah. For more benefit, please refer to Fataawa 86090 and 84976.
Allaah Knows best.