Although this action of Moses was not done to kill that person...

Although this action of Moses was not done to kill that person, for it was done to support an oppressed person, it caused Moses (as) to be counted as a murderer in the view of the people of Pharaoh. When Moses (as) was appointed as a prophet, he said to Allah that he feared the death of that Coptic man prevented him from his mission.

It is understood from the word ‘Kalla’ (nay) that the act of Moses (as) was not a deliberate murder, otherwise, Allah may not say to a willful murderer: “...‘By no means so go you both with Our signs, surely We are with you, hearing.” And therefore, Moses (as) implies that his breast straitens, and has: not enough capacity for the accomplishment of this mission.

Moses also added that his tongue was not eloquent enough and, therefore, he (as) asked Him to give his brother the messengership, too, so that they could struggle with together. Moses (as) wanted to carry out this great commandment with the help of Aaron, his brother, in spite of those stubborn oppressors.

The verse says: “And my breast straitens, and my tongue is not eloquent, therefore sent for Aaron (to help me).” In the next verse Moses (as) implies that, further, they have a charge of crime against him, as they think, because he had killed one of those cruel Coptic people when the man was quarrelling with an oppressed person from the children of Israel.

The verse says: “And they have a crime against me, therefore I fear that they may slay me.” Moses (as) feared that the people of Pharaoh might kill him as retaliation for slaying one of them and this could put an end to that great mission. As a matter of fact, Moses (as) encountered 4 problems on the way of carrying this great mission and he asked Allah to solve them, (the problem of denial, the problem of straitening of breast, the problem of retaliation, the problem of lack of eloquence).

Meanwhile, it gets clear that Moses (as) did not fear about his own life, but he feared that he might get killed before fulfilling his mission, and so he asked Allah to help him more, for succeeding in this struggle. The kind of means that Moses (as) asked Allah in this connection is a clear evidence upon this fact. He asked expansion of breast (great and extensive soul), eloquence, and commissionership of his brother, Aaron, to participate in this great job.