Charity - Do Not Give Charity to The Poor with The Intention of Having Him Pray for You

The servant is elevated through charity if he sincerely dedicates it to Allah, without seeking the supplication of the needy, praise, fame, or materialistic desires. So, if you give charity to a poor person do not do it to have them pray for you. Instead, spend on him seeking the pleasure of Allah, so that you may be included in the saying of Allah: 

وَمِنَ ٱلنَّاسِ مَن يَشْرِى نَفْسَهُ ٱبْتِغَآءَ مَرْضَاتِ ٱللَّهِ ۗ وَٱللَّهُ رَءُوفٌۢ بِٱلْعِبَادِ ٢٠٧

“And of the people is he who sells himself, seeking means to the approval of Allah. And Allah is kind to [His] servants”. 

(Surah Al-Baqarah :Ayat 207)

Shaykh al-Islam, may Allah have mercy on him, said regarding the saying of Allah:

وَيُطْعِمُونَ ٱلطَّعَامَ عَلَىٰ حُبِّهِۦ مِسْكِينًۭا وَيَتِيمًۭا وَأَسِيرًا ٨

إِنَّمَا نُطْعِمُكُمْ لِوَجْهِ ٱللَّهِ لَا نُرِيدُ مِنكُمْ جَزَآءًۭ وَلَا شُكُورًا ٩

"And they give food in spite of love for it to the needy, the orphan, and the captive, [saying], 'We feed you only for the countenance of Allah. We wish not from you reward or gratitude.'" 

[Surah Insan:8-9]

And whoever seeks supplication or praise from the poor has gone against this verse. In the hadith narrated in Sunan Abi Dawood1, it is mentioned: "Whoever does a good deed to you, repay him. If you cannot find anything to repay him, then pray for him until you know that you have repaid him."

For this reason, when Aishah, may Allah be pleased with her, would send someone a gift; she would ask the carrier of the gift: "What did they say to you?" He would say: "May Allah bless you." So Aisha would say: "May Allah bless them too. We will respond to them in the same way they spoke, and our reward will remain for us." 

(Al-Nasa'i)1

And some of the Salaf said: "If you give to a poor person and he says, 'May Allah bless you,' then say: 'May Allah bless you too.'" Meaning, if he rewards you with supplication, then supplicate for him with the same supplication, so that you do not get any reward by him2

It is also stated: 'If someone seeks compensation from people - praise, supplication, or anything else - they have not acted kindly towards them for the sake of Allah.'3

Shaykh al-Islam, may Allah have mercy on him, explained that giving charity to receive supplication does not include the giver in Allah's saying:

 إِنَّمَا نُطْعِمُكُمْ لِوَجْهِ ٱللَّهِ لَا نُرِيدُ مِنكُمْ جَزَآءًۭ وَلَا شُكُورًا ٩

“[saying], 'We feed you only for the countenance of Allah” 

[Surah Insan: 9]

The Muslim gives charity for the sake of Allah, and whatever is achieved through it, such as relief from distress and removal of worries, is a result of giving charity for the sake of Allah.

References

1 Book of Zakat, Chapter on Giving to Those Who Ask in the Name of Allah, Number (1672), from the narration of Ibn Umar, may Allah be pleased with them.

1 Al-Sunan Al-Kubra, Book of Actions for Day and Night, What to Say to Someone Who Does You a Favor, Number (10062).

2 Majmu' Fatawa Shaykh al-Islam (112/11)

3 Majmu' Fatawa Shaykh al-Islam (54/1)