Hebrews 2:1

Therefore. That is, because of the supremacy of the Son over the angels, the theme of ch. 1, and consequently because of the importance of the message of the Son “in these last days” (see on ch. 1:2).

Give the more earnest heed. Or, “pay the greater attention.” It is the Son, Himself God, who has spoken.

Which we have heard. The manner in which the message came to them is described in v. 3.

Let them slip. The clause may be translated, “lest we should float past them,” or “lest we should drift away from them.” The author fears that his readers will fail to recognize the transcendent importance of that which was spoken by Christ. The Jewish Christians possessed great zeal for OT revelation but were in danger of failing to see the importance of the new revelation that had been given.

Drifting is one of the easiest and most pleasant means of locomotion, but it is also a most treacherous and dangerous one. No effort is needed to drift, and as one glides down the river toward sure death, the feeling is that of well-being and contentment, even of drowsiness. The downward movement is hardly perceptible, for as the boat moves down the river it seems to remain motionless. The water moves with the boat and thus appearances are deceitful.