We need not discuss the metallurgy of verse 4. But clearly Aaron asked for the earrings, not, as some would have it, hoping that vanity and covetousness would hinder their being given, but simply in order to get gold for the bad work which he was ready to do. The reason for making the thing in the shape of a calf is probably the Egyptian worship of Apis in that form, which would be familiar to the people.
We must note that it was the people who said, 'These be thy gods, O Israel!' Aaron seems to keep in the rear, as it were. He makes the calf, and hands it over, and leaves them to hail it and worship. Like all cowards, he thought that he was lessening his guilt by thus keeping in the background. Feeble natures are fond of such subterfuges, and deceive themselves by them; but they do not shift their sin off their shoulders.
Then he comes in again with an impotent attempt to diminish the gravity of the revolt. 'When he _saw_ this,' he tried to turn the flood into another channel, and so proclaimed a 'feast to Jehovah'!--as if He could be worshipped by flagrant defiance of His commandments, or as if He had not been disavowed by the ascription to the calf, made that morning out of their own trinkets, of the deliverance from Egypt. A poor, inconsequential attempt to save appearances and hallow sin by writing God's name on it! The 'god' whom the Israelites worshipped under the image of a calf, was no less another 'god before Me,' though it was called by the name of Jehovah. If the people had their idol, it mattered nothing to them, and it mattered as little to Jehovah, what 'name' it bore. The wild orgies of the morrow were not the worship which He accepts.
What a contrast between the plain and the mountain! Below, the shameful feast, with its parody of sacrifice and its sequel of lust-inflamed dancing; above, the awful colloquy between the all-seeing righteous Judge and the intercessor! The people had cast off Jehovah, and Jehovah no more calls them 'My,' but '_thy_ people.' They had ascribed their Exodus first to Moses, and next to the calf. Jehovah speaks of it as the work of Moses.
A terrible separation of Himself from them lies in '_thy_ people, which _thou_ broughtest up,' and Moses' bold rejoinder emphasises the relation and act which Jehovah seems to suppress (verse 11). Observe that the divine voice refuses to give any weight to Aaron's trick of compromise. These are no worshippers of Jehovah who are howling and dancing below there. They are 'worshipping _it_, and sacrificing to it,' not to Him. The cloaks of sin may partly cover its ugliness here, but they are transparent to His eyes, and many a piece of worship, which is said to be directed to Him, is, in His sight, rank idolatry.
We do not deal with the magnificent courage of Moses, his single-handed arresting of the wild rebellion, and the severe punishment by which he trampled out the fire. But we must keep his severity in mind if we would rightly judge his self-sacrificing devotion, and his self-sacrificing devotion if we would rightly judge his severity.
No words of ours can make more sublime his utter self-abandonment for the sake of the people among whom he had just been flaming in wrath, and smiting like a destroying angel. That was a great soul which had for its poles such justice and such love. The very words of his prayer, in their abruptness, witness to his deep emotion. 'If Thou wilt forgive their sin' stands as an incomplete sentence, left incomplete because the speaker is so profoundly moved. Sometimes broken words are the best witnesses of our earnestness. The alternative clause reaches the high-water mark of passionate love, ready to give up everything for the sake of its objects. The 'book of life' is often spoken of in Scripture, and it is an interesting study to bring together the places where the idea occurs (see Ps. lxix. 28; Dan. xii. 1; Phil. iv. 3; Rev. iii. 5). The allusion is to the citizens' roll (Ps. lxxxvii. 6). Those whose names are written there have the privileges of citizenship, and, as it is the 'book of life' (or '_of the living_'), life in the widest sense is secured to them. To blot out of it, therefore, is to cut a man off from fellowship in the city of God, and from participation in life.