Re: When a pious person died they make a place of worship at his grave
There is a difference between the martyrs and others and it is good to understand this.
والفرق بين حياة الشهداء وغيرهم من المؤمنين الذين أرواحُهم في الجنة من وجهين
The difference between the life of the martyrs and others from among the believers who are in Paradise is in two respects:
أحدهما: أن أرواح الشُّهداء تُخلق لها أجسادٌ، وهي الطَّير التي تكون في حواصلها، ليكمل بذلك نعيمها، ويكون أكمل من نعيم الأرواح المجردة عن الأجساد، فإن الشهداء بذلوا أجسادهم للقتل في سبيل الله، فعُوِّضوا عنها بهذه الأجساد في البرزخ
The first difference is that they have bodies created for them in the form of birds and this is more complete then simply having the souls without the body.
والثاني: أنهم يُرزقون في الجنة، وغيرهم لم يثبت له في حقِّه مثل ذلك
And second they are given Rizq while for others this has not been established.
It has been narrated on the authority of Masruq Who said:
We asked 'Abdullah about the Qur'anic verse:" Think not of those who are slain in Allah's way as dead. Nay, they are alive, finding their sustenance in the presence of their Lord.." (iii. 169). He said: We asked the meaning of the verse (from the Holy Prophet) who said:
The souls, of the martyrs live in the bodies of green birds who have their nests in chandeliers hung from the throne of the Almighty. They eat the fruits of Paradise from wherever they like and then nestle in these chandeliers.
Once their Lord cast a glance at them and said: Do ye want anything? They said: What more shall we desire? We eat the fruit of Paradise from wherever we like. Their Lord asked them the same question thrice. When they saw that they will continue to be asked and not left (without answering the question). they said: O Lord, we wish that Thou mayest return our souls to our bodies so that we may be slain in Thy way once again. When He (Allah) saw that they had no need, they were left (to their joy in heaven).
[Sahih Muslim Hadith No. 1887]
Source(s)
The difference between the souls of the martyrs and others from the believers.