Bribery matters

1
Many years ago I heard a rabbi talking about the prohibition of giving and receiving bribes in any public position, not just for a judge. He argued for a Torah prohibition . I don’t remember what his source was. Can the rabbi tell me?
2
I have been a tax collector for many years in some ordinary community, most of whom are people with simple to low incomes, and I am like them.
We have one in the community who has a lot of money, probably really rich, but he is a man with a bad nature, who grumbles, complains, criticizes, stings bitterly, and resents those around him. That is how he is by nature. It is impossible to hear anything good or beautiful from him or praise him for anything in the world.
He decided that he was a professional cantor. He is musical, but he doesn’t know how to read well, maybe he has some kind of disability, and his letters are all upside down. He reads words with terrible confusion, even in the blessings themselves and out loud…
During the year it’s somehow reasonable because you probably hear from everyone how to read, but on terrible days it’s really terrible.
I suffer from it every year.
The public, some of them indifferent or containing his mistakes and disruptions, some of them disturbing and embarrassing (we are hundreds of worshippers), and this is sufficient reason not to let him be a cantor in these terrible times.
But there is another reason: every year and over the years, every role I was given caused me great and ongoing suffering, many times more hassle and preoccupation than all the other matters of prayers and organizing for the holidays.
He doesn’t do what I tell him, he argues about every instruction, he always has something to say, he will make a fuss and go and explain to everyone how screwed up the tax collector is and doesn’t know how to calculate time and doesn’t understand anything about anything. He always has different customs than what I tell him. He pesters me before, after, and during the holidays, and I’m not exaggerating at all.
Every year I swear anew that I will not give him anything in the future, but I feel sorry for him again and again and again and regret it because he is always a genius at making up harassing complaints about how bad our community is, how good other communities are, and they are just lurking underground, doing nothing but bad all day, every day.
In short, last year I stood bravely and didn’t give him anything. Although I suffered harassment for not giving a great cantor like him a role, and I also gave one to someone of lesser value… but as I estimated, the harassment for not giving him a role is half or a quarter of giving him a role, and then he feels important, proud, and busy harassing.
 
This year is a subscription and it’s over with me not to let him and suffer a little for it and not much for when he has a role
He understood where the wind was blowing and offered me a large sum of money if he accepted the position.
Now the question
Am I allowed to accept the bribe and give him a position? After all, the main reason I don’t give it to him is because I suffer and not because the public suffers due to his disability. For the sake of funding, am I allowed to tolerate his harassment and give him a position? And will the law be different if I donate the treasure to the synagogue?