BhG 1.21-23

syntax

he acyuta (O Acyta!),
yāvat (as long as) ahaṁ (I) etān (these) yoddhu-kāmān (who are eager to fight) avasthitān (arrayed), mayā (by me) kaiḥ saha (with whom) asmin (in this) raṇa-samudyame (engagement in battle) yoddhavyam (to be fought with) nirīkṣe (I look at).
ye ete (those who) atra (here) samāgatāḥ (who are assembled), yuddhe (in battle) dur-buddheḥ (of the evil-minded) dhārtarāṣṭrasya (of the son of Dhṛtarāṣṭra) priya-cikīrṣavaḥ (those who desire to please).
[yāvat] (as long as) ahaṁ (I) [tān] (those) yotsyamānān (who will be fighting) avekṣe (I look at),
[tāvat] (so long) ubhayoḥ (of both) senayoḥ (of the two armies) madhye (in the middle) me (my) ratham (chariot) sthāpaya (you must place).

grammar

senayoḥ	–	senā 6n.2 f. – of the two armies;
ubhayoḥ	–	ubhā sn. 6n.2 f. – of both;
madhye	–	madhya 7n.1 n. – in the middle, inside;
ratham	–	ratha 2n.1 m. – chariot;
sthāpaya	–	√sthā (to stand) Imperat. caus. P 2v.1 – cause to stand;
me	–	asmat sn. 6n.1 – my (shortened form of: mama);
acyuta	–	a-cyuta (√cyu – to shake, to fall, to deviate) PP 8n.1 m. – O unfailling one;

******

yāvat	–	av. – as long as, as great;
etān	–	etat sn. 2n.3 m. – these;
nirīkṣe	–	nir-√īkṣ (to look at, to behold) Praes. Ā 3v.1 – I look at;
aham	–	asmat sn. 1n.1 – I;
yoddhu-kāmān	–	yoddhu-kāma 2n.3 m.; ye yoddhuṁ kāmayante tān – those who are eager to fight (from: √yudh – to fight; √kam –to wish, to love, to long for, kāma – wish, desire; suffix goes with inf. without a nasal: yoddhu = yoddhum);
avasthitān	–	ava-sthita (ava-√sthā – to stand) PP 2n.3 m. – arrayed;
kaiḥ	–	kim sn. 3n.3 m. – with whom;
mayā	–	asmat sn. 3n.1 – by me;
saha	–	av. – along with (postposition, requires instrumental);
yoddhavyam	–	yoddhavya (√yudh – to fight) PF 1n.1 n. – to be fought with;
asmin	–	idam sn. 7n.1 m. – in this;
raṇa-samudyame	–	raṇa-sam-ud-yama 7n.1 m.; TP: raṇasya samudyama iti – in the engagement in battle (from: √raṇ – to rejoice, raṇa – delight, fight, battle; sam-ud-√yam – to raise, to set up, samudyama – raising up, readiness to, exertion, setting about);

******

yotsyamānān	–	yotsyamāna (√yudh – to fight) PPr Fut. 2n.3 m. – those who will be fighting;
avekṣe	–	ava-√īkṣ (to look at, to behold) Praes. Ā 3v.1 – I look at;
aham	–	asmat sn. 1n.1 – I;
ye	–	yat sn. 1n.3 m. – those who;
ete	–	etat sn. 1n.3 m. – these;
atra	–	av. – here;
samāgatāḥ	–	sam-āgata (ā-√gam – to come) PP 1n.3 m. – who are assembled;
dhārtarāṣṭrasya	–	dhārtarāṣṭra 6n.1 m. – of the son of Dhṛtarāṣṭra (from: dhṛta-rāṣṭra – by whom the kingdom is held, from: √dhṛ – to hold, PP dhṛta – held; rāṣṭra – kingdom);
durbuddheḥ	–	dur-buddhi 6n.1 m. – of one with bad intelligence, of avi-minded (from: dur / dus – prefix: difficult, bad, hard; √budh – to wake, to perceive, to understand, buddhi – intelligence, thought, understanding, knowledge, idea, opinion);
yuddhe	–	yuddha 7n.1 n. – in battle (from: √yudh – to fight);
priya-cikīrṣavaḥ	–	priya-cikīrṣu 3n.1 m.; TP: ye priyaṁ kartum icchavas te – those who desire to please (from: √prī – to please, priya – beloved, dear to, love, kindness; √kṛ – to do, des. cikīrṣu – who desires to do);

textual variants

In some manuscripts before the third pada of the verse there is: arjuna uvāca (Arjuna spoke);
senayor ubhayor madhye → ubhayor senayor madhye (between the two armies);
nirīkṣe → nirīkṣye (is looked at);
kair → yair / tair (with whom / with them);
raṇa-samudyame → raṇa-samudyate (in a begun battle);
yotsyamānān → yodhyamānān (being fought PPr caus. pass.);
avekṣe → avekṣye (will be looked at);
dhārtarāṣṭrasya → dhṛtarāṣṭrasya / duryodhanasya (of Dhṛtarāṣṭra / of Duryodhana);

Śāṃkara

no commentary up to the verse BhG 2.10

Rāmānuja

no commentary up to the verse BhG 1.25

Madhva

no commentary up to the verse BhG 2.11

Śrīdhara

tad eva vākyam āha senayor ubhayor ity ādi | yāvad etān iti | nanu tvaṃ yoddhā na tu yuddha-prekṣakas tatrāha kair mayety ādi | kaiḥ saha mayā yoddhavyam | yotsyamānān iti dhārtarāṣṭrasya duryodhanasya priyaṃ kartum icchanto ye iha samāgatāḥ tān ahaṃ drakṣyāmi yāvat | tāvad ubhayoḥ senayor madhye me rathaṃ sthāpayety anvayaḥ

Viśvanātha

no commentary up to the verse BhG 1.25

Baladeva

arjuna-vākyam āha senayor iti | he acyutedi svabhāva-siddhād bhakta-vātsalyāt pāramaiśvaryāc ca na cyavase smeti tena tena ca niyantirto bhaktasya me vākyāt tatra rathaṃ sthitaṃ kuru nirbhaya tatra ratha-sthāpane phalam āha yāvad iti | yoddhu-kāmān na tu sahāsmābhiḥ sandhiṃ cikīrṣūn | avasthitān na tu bhītyā pracalitān |
nanu tvaṃ yoddhā, na tu yuddha-prekṣakas tatas tad-darśanena kim iti cet tatrāha kair iti | asmin bandhūnām eva mitho raṇodyoge kair bandhubhiḥ saha mama yuddhaṃ bhāvīty etaj-jñānāyaivaa madhye ratha-sthāpanam iti |
nanu bandhutvād eet sandhim eva vidhātsyantīti cet tatrāha yotsyamānān iti na tu sandhiṃ vidhāsyataḥ | avekṣe pratyemi | durbuddheḥ kudhiyaḥ svajīvanopāyānabhijñasya yuddhe na tu durbuddhy-apanayane | ato mad-yuddha-pratiyogi-nirīkṣaṇaṃ yuktam iti