Hijrah means to move from the land of the Kuffaar to the land of the Muslims for the sake of saving o­ne's Deen. Hijrah, with this meaning, is obligatory upon the Muslims until the sun rises from the west before the  establishment  of Judgment Day. The Messenger of Allaah (sallallaahu 'alaihi wa sallam) said that he is free from the Muslim who lives among pagans. If a Muslim can move from the lands of the Kuffaar, then Allaah forbids him to stay in those lands. He may stay, if he gives da 'wah and propagates Islaam, and shows his Deen openly. Allaah the Exalted said,

"When angels take the souls of those who die while they have wronged their souls, they say, 'In what [state] were you?'   They reply:   'We were weak and oppressed in the earth.'   [The Angels] say:  'Was not the earth of Allaah spacious enough for you to move yourselves away [from evil]?' Such men will find their abode in Hell, what an evil refuge! Except those who are [really] weak and oppressed:   men, women, and children who have no means in their power, nor can they find a way [to escape]. For these, there is hope that Allaah will forgive, because Allaah blots out [sins] and forgives again and again." [1]

2 - Helping the Muslims with money, body, and tongue in what they need in their Deen and material life...

Allaah the Exalted said,

"The Believers, men and women, are protectors, o­ne of another," [2]

Allaah the Exalted said,

"...but if they seek your aid in Deen, it is your duty to help them, except against a people with whom you have a treaty of mutual alliance..." [3]

3 - Feeling sympathy for the Muslims whenever harm comes to them and feeling happy when good comes to them...

The Messenger of Allaah  (sallallaahu 'alaihi wa sallam) said,

"The example of the Muslims is like a body, if o­ne part of it gets hurt, then all of the body shares that hurt [like a body stricken] with a fever and no sleeping."

Then he  (sallallaahu 'alaihi wa sallam)  said,

"The Believer to another Believer is like a building [or structure]. [He then brought his hands together with his fingers intertwined."

4 - Advising and counseling the Muslims, always loving good things to happen to them, not cheating them, tricking them or going behind their back...

He (sallallaahu 'alaihi wa sallam) said,
"No o­ne of you has Eemaan until he loves for his brother what he loves for himself," and, "A Muslim doesn't betray his brother Muslim nor does he go behind his back,"

Also, he (sallallaahu 'alaihi wa sallam) said,
"All of a Muslim's blood, property, wealth, and family is sacred to another Muslim."

Further, he (sallallaahu 'alaihi wa sallam) said:
"Do not hate each other, do not backbite each other, (..), and do not out price each other, but rather be worshippers of Allaah and brothers."

5 - Being respectful to them, not humiliating them or speaking evil about them...

Allaah the Exalted said,

"O you believe! Let not some men among you laugh at others- it may be that the [latter] are better than the [former] -, nor defame each other, nor call each other by [offensive] nicknames- ill-seeming is a name [to be used to describe o­ne] connoting wickedness after he has believed. Those who do not desist are [indeed] doing wrong. O you who believe! Avoid suspicion, because suspicion in some cases is a sin. Spy not o­n each other, nor backbite each other. Would any of you like to eat the flesh of his dead brother? Nay, you would hate it! So, fear Allaah, because Allaah is Oft-Returning, the o­ne Who treats gentlly whoever He is kind with." [4]

6 - To be with them in the time of prosperity and hardship...

This is the opposite of the hypocrites because they are with the believers when times are easy and desert them when times are hard. Allaan the Exalted said,

"(The Hypocrites are) those who wait and watch you. If you gain a victory from Allaah, they say, "Were we not with you?' But if the disbelievers gain a success, they say [to the disbelievers], "Did we not gain an advantage for you. And did we not guard you from the Believers?'..." [5]