A.T. Robertson Commentary Luke 19:37

"And as he was now drawing nigh, [even] at the descent of the mount of Olives, the whole multitude of the disciples began to rejoice and praise God with a loud voice for all the mighty works which they had seen;" — Luke 19:37 (ASV)

At the descent (προς τη καταβασε). Epexegetic of "drawing nigh." They were going by the southern slope of the Mount of Olives. As they turned down to the city, the grand view stirred the crowd to rapturous enthusiasm. This was the first sight of the city on this route which is soon obscured in the descent. The second view bursts out again (verse 41). It was a shout of triumph from the multitude with their long pent-up enthusiasm (verse 11), restrained no longer by the parable of the pounds.

For all the mighty works which they had seen (περ πασων ειδον δυναμεων). Neat Greek idiom, incorporation of the antecedent (δυναμεων) into the relative clause and attraction of the case of the relative from the accusative ας to the genitive ων. And note "all." The climax had come, Lazarus, Bartimaeus, and the rest.