The embarrassment felt by a person who needs to beg: Berachot 6b; Chagigah 5a
Reward
Testing Gd to see if He will reward charity: Taanit 9a
Jerusalem will be redeemed through Charity: Shabbat 139a
The main reward for keeping Fast Days is in giving Charity to support paupers afterward: Berachot 6b (See Rashi)
One is repaid for charity in accordance with the effort invested: Succah 49b
Charity saves one's life: Shabbat 156b
Charity increases one's wealth: Taanit 8b-9a; Gittin 7a
Charity overturns a Divine judgment for death: Rosh HaShanah 16b
Charity saves people from Hell: Gittin 7a
Reward for giving in private: Shabbat 104a
Reward for giving to someone who really doesn't need it: Bava Kama 16b
Reward for giving in the hope of getting a specific prayer answered: Rosh haShanah 4a; Pesachim 8a
Your reward will come until your lips wear out from saying "Enough!": Makkot 23b
A pious man who gave tzedakah and merited great wealth in the coming year: Berachot 18b