And test the orphans [in their abilities] until they reach marriageable age. (4:6)

Almuntakhab Fi Tafsir Alquran Alkarim

And test the orphans now and then until they reach maturity and be fit -for marriage. If you feel they are characterized by good sense and prudence, then hand over to them their property and you must not abuse it nor act with expedition of time and events to absorb it or devour it before they come of age. And he who is entrusted with the property must not impose a liability or charge a fee for the execution of his functions, but be virtuous should he be wealthy and opulent. But if he is poor, then he may remunerate himself with equity. And when you hand over the, property to them -the orphans- you must have others witness the transfer, and sufficient is Allah to be Hasibun (a Witness Who calls to account)

Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(4:6) Test the orphans until they reach the age of marriage, *9 and then if you find them mature of mind hand over to them their property, *10 and do not eat it up by either spending extravagantly or in haste, fearing that they would grow up (and claim it). If the guardian of the orphan is rich let him abstain entirely (from his ward's property); and if he is poor, let him partake of it in a fair measure. *11 When you hand over their property to them let there be witnesses on their behalf. Allah is sufficient to take account (of your deeds).

And test the orphans [in their abilities] until they reach marriageable age. meaning

*9). When such people approach their majority their mental development should be watched so as to determine to what extent they have become capable of managing their own affairs.
*10). Two conditions have been laid down for handing over the charge of their properties to such people. The first of these is the attainment of puberty, and the second is that of mental maturity - i.e. the capacity to manage their affairs in a sound and appropriate manner. There is full agreement among Muslim jurists with regard to the first condition. As for the second condition, Abu Hanifah is of the opinion that if an orphan does not attain mental maturity after he has attained puberty, the guardian of the orphan should wait for a maximum of seven years after which he should hand over the property to its owner regardless of whether he has attained maturity or not. According to Abu Yusuf, Muhammad b. al-Hasan and Shafi'i, maturity is an indispensable pre-condition for the handing over of property. If one were to apply the doctrine of the latter jurists it would probably be more appropriate to refer particular cases to a judge under Islamic law. If the judge is convinced that the person concerned lacks maturity he should make adequate arrangements for the supervision of that person's financial affairs. (For a more complete study of the subject see Jassas, vol. 2, pp. 59 ff.; Ibn Rushd, Biddyat al-Mujtahid, 2 vols., Cairo, Al-Maktabahal-Tijariyahal-Kubra, n.d., vol. 2, pp. 275ff.-Ed.)
*11). The guardian is entitled to remuneration for his service. The amount of this remuneration should be such as is deemed to be fair by neutral and reasonable people. Moreover, the guardian is instructed that he should take a fixed and known amount by way of remuneration, that he should take it openly rather than secretly, and that he should keep an account of it.
 

And test the orphans [in their abilities] until they reach marriageable age. meaning in Urdu

اور یتیموں کی آزمائش کرتے رہو یہاں تک کہ وہ نکاح کے قابل عمر کو پہنچ جائیں پھر اگر تم اُن کے اندر اہلیت پاؤ تو اُن کے مال اُن کے حوالے کر دو ایسا کبھی نہ کرنا کہ حد انصاف سے تجاوز کر کے اِس خوف سے اُن کے مال جلدی جلدی کھا جاؤ کہ وہ بڑے ہو کر اپنے حق کا مطالبہ کریں گے یتیم کا جو سرپرست مال دار ہو وہ پرہیز گاری سے کام لے اور جو غریب ہو وہ معروف طریقہ سے کھائے پھر جب اُن کے مال اُن کے حوالے کرنے لگو تو لوگوں کو اس پر گواہ بنا لو، اور حساب لینے کے لیے اللہ کافی ہے