The Quran

يا أَيُّهَا الَّذينَ آمَنوا لا تَقتُلُوا الصَّيدَ وَأَنتُم حُرُمٌ ۚ وَمَن قَتَلَهُ مِنكُم مُتَعَمِّدًا فَجَزاءٌ مِثلُ ما قَتَلَ مِنَ النَّعَمِ يَحكُمُ بِهِ ذَوا عَدلٍ مِنكُم هَديًا بالِغَ الكَعبَةِ أَو كَفّارَةٌ طَعامُ مَساكينَ أَو عَدلُ ذٰلِكَ صِيامًا لِيَذوقَ وَبالَ أَمرِهِ ۗ عَفَا اللَّهُ عَمّا سَلَفَ ۚ وَمَن عادَ فَيَنتَقِمُ اللَّهُ مِنهُ ۗ وَاللَّهُ عَزيزٌ ذُو انتِقامٍ

Muhammad Asad

O you who have attained to faith! Kill no game while you are in the state of pilgrimage. And whoever of you kills it intentionally,¹ [shall make] amends in cattle equivalent to what he has killed - with two persons of probity giving their judgment thereon - to be brought as an offering to the Ka'bah;² or else he may atone for his sin by feeding the needy, or by the equivalent thereof in fasting:³ [this,] in order that he taste the full gravity of his deed, [while] God shall have effaced the past. But whoever does it again, God will inflict His retribution on him: for God is almighty, an avenger of evil.

From the last sentence of this verse it appears that by the "intentional" killing referred to here only an isolated incident (or a first offence) can be meant, and not a wilful, persistent "transgressing of the bounds of what is right", which the preceding verse condemns so severely. It is to be borne in mind that the term "game" (sayd) relates in this context only to edible animals: for, according to several authentic Traditions, the killing of a dangerous or highly obnoxious animal - for instance, a snake, a scorpion, a rabid dog, etc.- is permitted even in the state of pilgrimage.
I.e., for distribution among the poor. In this context, the Ka'bah signifies, metonymically, the sacred precincts of Mecca, and not only the sanctuary itself (Razi). The "two persons of probity" are supposed to determine the approximate flesh-value of the wild animal which has been killed, and to decide on this basis as to what domestic animal should be offered in compensation.
Lit., "or [there shall be] an atonement by way of feeding the needy, or an equivalent by way of fasting". These two alternatives are open to a pilgrim who is too poor to provide a head or heads of cattle corresponding in value to the game which he has killed, or - in the last-named alternative - too poor even to feed other poor people. Since neither the Qur'an nor any authentic Tradition specifies the number of poor to be fed or the number of days of fasting, these details are obviously left to the conscience of the person concerned.