In the laws, what was an abomination was things forbidden by God - foods, actions, even a certain kind of worship. For example, eating sacrificial food after "expiry date", which connotes corruptibility of what we offer to God. Here, referenced to our worship in the spirit, we need to be careful not to let the things that God hates be in our heart as we offer ourselves and our services:
Leviticus 7:18And if [any] of the flesh of the sacrifice of his peace offerings be eaten at all on the third day, it shall not be accepted, neither shall it be imputed unto him that offereth it: it shall be an abomination, and the soul that eateth of it shall bear his iniquity.
Leviticus 11:10And all that have not fins and scales in the seas, and in the rivers, of all that move in the waters, and of any living thing which [is] in the waters, they [shall be] an ABOMINATION unto you:
