Where in the bible does it mention weeping and moaning and gnashing of teeth?

No. The "weeping and gnashing of teeth" Jesus speaks of doesn't occur in heaven. This reaction is applied to various people or groups of people depending on the particular teaching.

In Matthew 18:2, it is applied to unbelieving Jews (the "children of the kingdom" who find themselves "cast out into outer darkness").

In Matthew 13:42, it is said of "those who practice lawlessness."

In Matthew 13:50, it is said of "the wicked."

In Matthew 22:13 (where it appears in the context of a parable), it is said of a man who seeks to enter a wedding feast without a proper garment. The application is to those who follow false teaching, thinking it will allow them entrance into heaven.

In Matthew 24:51, it is said of an "evil servant."

Matthew 25:30 has a similar application, where it is said of an "unprofitable servant."

The final NT appearance of the phrase is Luke 13:28, again in the context of a parable, where Jesus applies it to those who seek to enter the "Master's house" and are turned away, because the Master doesn't know them. The application here is to those who anticipate salvation, but discover that it is denied them. Despite their insistence that they "ate and drank in Your [Jesus'] presence, and You taught in our streets," Jesus calls them "workers of iniquity;" in other Words, adherents of a corruption of true Christianity.

In every instance, the "weeping and gnashing of teeth" is done by those who discover that they will be denied the eternal reward.