Not all spirits go to Barzakh because:
1.Not all spirits are muslims.
2.Not all Muslim spirits are pious enough.
Many muslim spirits suffer the torment in grave after their death due to their sins. However, this torment can end due to following reasons:
- Sadqa-e-jaria
- family/relatives/friends who pray for them and recite ALLAH’s ayats for them.
- Some WALI-ALLAH conducts some chilla in a certain area which is close-by/near a graveyard and after his chilla to please ALLAH ,in his prayer he also prays for souls of dead muslims and ALLAH elevates the status of those sinful muslim spirits also.
Those spirits go to Barzakh directly which are very strong. Weak spirits cannot go to Barzakh directy without help from reasons stated above.
A weak spirit is the one who in his life kept running after wordly things, like money,houses,cars and ignored salah and Koran and did actions liked by satan like flirting,adultery,frauds,lies etc. He maybe a healthy person in his life but his spirit is weak because he fell as satan victim through these acts.
A strong spirit is the one which is pious and stays away from wordly filth.
A strong spirit maybe of a person who is physically weak and has killed his lust for wordly desires (nafs), but stays in constant “zikr” of ALLAH through salah and good deeds etc.