The Allies of Allah s.w.t.

The allies of Allah are of two levels: forerunners those who brought near - and those of the right hand who act in moderation. Allah, the Exalted says reminding the Day of Judgement: "And you (all) will be in three kinds (i.e separate groups). So those on the Right Hand and Who will be those of the Right Hand? And those on the Left Hand and who will be those on the Left Hand? And those foremost will be foremost in Paradise. They will be those nearest to Allah." [Surah al-Waqiyah (56): 8-12]

And again Allah says in the end of the same Soorah:  "Then, if the dying person be of the Muqarraboon (those brought near to Allah.) (There is for him) rest and provision, and a Garden of delights (Paradise). And if he be of those on the Right Hand. Then there is safety and peace for those on the Right Hand. But if he be of the denying then for him is entertainment with boiling water. And burning in Hell-Fire." [Surah al-Waqiyah (56): 88-94]

And the actions of these two groups are mentioned in the Hadith of Prophet Muhammad (salallahu alaihi wa-sallam): 
"Allah says: "Whoever takes a Wali (loyal slave) of Mine an enemy, I will wage war on him; and My slave will not perform any act with which he draws closer to Me, more beloved to Me then when he fulfills what I have ordained on him; and My salve will keep drawing closer to Me by performing the Nawafil (voluntary acts of worship) until I love him, and when I love him, I will be his hearing with which he hears, his sight with which he sees, his hands with which he strikes, and his legs with which he walks; and if he asks Me, I will give him; and if he seeks refuge with Me, I will grant him refuge." [Saheeh Bukhari]

Consequently, the righteous - those of the Right Hand are those who seek to come close to Allah with obligatory actions: they do that which Allah has ordered them to do, and avoid that which Allah has forbidden them, and do not demand of themselves the doing of the commendable but less than obligatory (i.e. mandoob), or the avoiding of some of the disrecommendable of the allowed (i.e. makrooh)

As for the forerunners those brought near, they sought to come close to Allah with extra efforts after the obligatory. They did the obligatory and the commendable, and avoided the forbidden and the non-recommended. When they sought to come close to Him with everything within their ability of that which they love, Allah's love for them became complete.

"O people, we have created you from a male and a female and made you in peoples and tribes that you may know each other. Verily, the noblest of you in the sight of Allah is the greatest in righteous practice." [Soorah al-Hujarat (49): 13]

Abu Hurairah narrates in a Saheeh Hadith: "The Prophet of Allah (salallahu alaihi wa-sallam) was asked: "Which people are the best? He said: "Those greatest in taqwa (righteous practice)”. [Bukhari and Muslim]