Shekalim 9 - Scooping three times
The family of Rabban Gamliel was especially zealous: they would enter the chamber and throw the coins right before the priest doing the scooping, and he would try to make sure to scoop their coins into his box.
On this subject of extra effort, Rabbi Pinchas ben Yair outlines ten steps of spiritual growth: extra effort brings to being free from wrongdoing; that brings one to re-think his previous wrongful acts; this leads to holiness, that is, refraining even from permitted pleasures; this leads to humility; humility brings one to realize one's shortcomings and to honest desire not to do wrong again; this brings to doing good beyond the letter of the law - which brings Divine inspiration in its wake; then he can resurrect the dead, and this, in turn, brings Elijah the Prophet, may he be remembered for good.
Art: Divine inspiration by Petrus Van Schendel
