In Genesis 29:17, this signifies that the affections of external truth have feeble and wavering understanding. (Arcana Coelestia 3820)

In Numbers 13:18, it signifies being without supporting truths. (Arcana Coelestia 6344)

In Psalm 6:2, weakness occurs in a prayer of the Lord to the Father when He was in the last state of temptation, which is despair. (The Inner Meaning of the Prophets and Psalms 256.)

In Psalm 109:24, it signifies a lack of nourishing goods and truths. (Arcana Coelestia 9050[7])

7326. 'And they will be blood' means that they will falsify truths. This is clear from the meaning of 'blood' as the falsification of truth, dealt with above in 7317. In the genuine sense 'blood' means the holiness of love, as a consequence of which it means charity and faith, since they are holy attributes of love, and as a consequence of which again it means holy truth coming forth from the Lord, tool, 4735, 6978. In the contrary sense however 'blood' means violence done to charity and also violence done to faith, thus to holy truth coming forth from the Lord. And since violence is done to it when it is falsified the falsification of truth is meant by 'blood'; or when there is a greater degree of violence, the profanation of truth is meant by 'blood'. Such profanation was meant by 'the eating of blood', which was why that practice was so strictly forbidden, 1003.