I pray thee, let me go over, and see the good land that is beyond Jordan, that goodly {k} mountain, and Lebanon.

(k) He means Zion, where the Temple should be built, and God honoured.

Wesley's Notes

3:25 Let me go over - For he supposed God's threatening might be conditional and reversible, as many others were. That goodly mountain - Which the Jews not improbably understood of that mountain on which the temple was to be built. This he seems to call that mountain, emphatically and eminently, that which was much in Moses's thoughts, though not in his eye.

Jamieson-Fausset-Brown Bible Commentary

25. I pray thee, let me go over, and see the good land that is beyond Jordan, that goodly mountain, and Lebanon-The natural and very earnest wish of Moses to be allowed to cross the Jordan was founded on the idea that the divine threatening might be conditional and revertible. "That goodly mountain" is supposed by Jewish writers to have pointed to the hill on which the temple was to be built (De 12:5; Ex 15:2). But biblical scholars now, generally, render the words-"that goodly mountain, even Lebanon," and consider it to be mentioned as typifying the beauty of Palestine, of which hills and mountains were so prominent a feature.

Matthew Henry's Concise Commentary

3:21-29 Moses encouraged Joshua, who was to succeed him. Thus the aged and experienced in the service of God, should do all they can to strengthen the hands of those who are young, and setting out in religion. Consider what God has done, what God has promised. If God be for us, who can be against us, so as to prevail? We reproach our Leader if we follow him trembling. Moses prayed, that, if it were God's will, he might go before Israel, over Jordan into Canaan. We should never allow any desires in our hearts, which we cannot in faith offer up to God by prayer. God's answer to this prayer had a mixture of mercy and judgment. God sees it good to deny many things we desire. He may accept our prayers, yet not grant us the very things we pray for. It God does not by his providence give us what we desire, yet if by his grace he makes us content without, it comes to much the same. Let it suffice thee to have God for thy Father, and heaven for thy portion, though thou hast not every thing thou wouldst have in the world. God promised Moses a sight of Canaan from the top of Pisgah. Though he should not have the possession of it, he should have the prospect of it. Even great believers, in this present state, see heaven but at a distance. God provided him a successor. It is a comfort to the friends of the church of Christ, to see God's work likely to be carried on by others, when they are silent in the dust. And if we have the earnest and prospect of heaven, let these suffice us; let us submit to the Lord's will, and speak no more to Him of matters which he sees good to refuse us.